It would be sufficient to post first 30 entries of SGGS ji to state that all that Baldev singh has stated is as per his understanding and Sikhs do believe in reincaranation.

******Page 4, Line 14
ਨਾਨਕ ਹੁਕਮੀ ਆਵਹੁ ਜਾਹੁ ॥੨੦॥
नानक हुकमी आवहु जाहु ॥२०॥
Nānak hukmī āvhu jāhu. ||20||
O Nanak, by the Hukam of God's Command, we come and go in reincarnation. ||20||
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 13, Line 18
ਨਿਜ ਘਰਿ ਮਹਲੁ ਪਾਵਹੁ ਸੁਖ ਸਹਜੇ ਬਹੁਰਿ ਨ ਹੋਇਗੋ ਫੇਰਾ ॥੩॥
निज घरि महलु पावहु सुख सहजे बहुरि न होइगो फेरा ॥३॥
Nij gẖar mahal pāvhu sukẖ sehjė bahur na ho*igo fėrā. ||3||
Within the home of your own inner being, you shall obtain the Mansion of the Lord's Presence with intuitive ease. You shall not be consigned again to the wheel of reincarnation. ||3||
Guru Arjan Dev - view Shabad/Paurhi/SalokPage 19, Line 3
ਆਵਣੁ ਜਾਣੁ ਨ ਚੁਕਈ ਮਰਿ ਜਨਮੈ ਹੋਇ ਖੁਆਰੁ ॥੩॥
आवणु जाणु न चुकई मरि जनमै होइ खुआरु ॥३॥
Āvaṇ jāṇ na cẖuk*ī mar janmai ho*ė kẖu*ār. ||3||
Their comings and goings in reincarnation do not end; through death and rebirth, they are wasting away. ||3||
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 19, Line 12
ਸੋ ਨਰੁ ਜੰਮੈ ਨਾ ਮਰੈ ਨਾ ਆਵੈ ਨਾ ਜਾਇ ॥
सो नरु जमै ना मरै ना आवै ना जाइ ॥
So nar jammai nā marai nā āvai nā jā*ė.
Then, they are not subject to birth and death; they do not come and go in reincarnation.
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 19, Line 15
ਬਿਨੁ ਸਬਦੈ ਭਰਮਾਈਐ ਦੁਬਿਧਾ ਡੋਬੇ ਪੂਰੁ ॥੧॥
बिनु सबदै भरमाईऐ दुबिधा डोबे पूरु ॥१॥
Bin sabḏai bẖarmā*ī*ai ḏubiḏẖā dobė pūr. ||1||
Without the Word of the Shabad, people wander lost in reincarnation. Through the love of duality, multitudes have been drowned. ||1||
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 19, Line 15
ਜਿਨਿ ਗੁਰਮੁਖਿ ਨਾਮੁ ਨ ਬੂਝਿਆ ਮਰਿ ਜਨਮੈ ਆਵੈ ਜਾਇ ॥੧॥ ਰਹਾਉ ॥
जिनि गुरमुखि नामु न बूझिआ मरि जनमै आवै जाइ ॥१॥ रहाउ ॥
Jin gurmukẖ nām na būjẖi*ā mar janmai āvai jā*ė. ||1|| rahā*o.
Those who do not become Gurmukh do not understand the Naam; they die, and continue coming and going in reincarnation. ||1||Pause||
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 21, Line 8
ਸਬਦਿ ਨ ਭੀਜੈ ਸਾਕਤਾ ਦੁਰਮਤਿ ਆਵਨੁ ਜਾਨੁ ॥
सबदि न भीजै साकता दुरमति आवनु जानु ॥
Sabaḏ na bẖījai sākṯā ḏurmaṯ āvan jān.
The evil-minded shaaktas, the faithless cynics, are not attuned to the Shabad; they come and go in reincarnation.
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 22, Line 14
ਜਿਨਿ ਹਰਿ ਹਰਿ ਨਾਮੁ ਨ ਚੇਤਿਓ ਸੁ ਅਉਗੁਣਿ ਆਵੈ ਜਾਇ ॥
जिनि हरि हरि नामु न चेतिओ सु अउगुणि आवै जाइ ॥
Jin har har nām na cẖėṯi*o so a*oguṇ āvai jā*ė.
Those who have not contemplated the Name of the Lord, Har, Har, are unworthy; they come and go in reincarnation.
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 23, Line 3
ਖੋਟੇ ਖੋਟੁ ਕਮਾਵਣਾ ਆਇ ਗਇਆ ਪਤਿ ਖੋਇ ॥੩॥
खोटे खोटु कमावणा आइ गइआ पति खोइ ॥३॥
Kẖotė kẖot kamāvaṇā ā*ė ga*i*ā paṯ kẖo*ė. ||3||
Practicing falsehood again and again, people come and go in reincarnation, and forfeit their honor. ||3||
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 25, Line 1
ਲੇਖਾ ਇਕੋ ਆਵਹੁ ਜਾਹੁ ॥੧॥
लेखा इको आवहु जाहु ॥१॥
Lėkẖā iko āvhu jāhu. ||1||
According to the account of our actions, we come and go in reincarnation. ||1||
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 26, Line 1
ਸਭ ਦੁਨੀਆ ਆਵਣ ਜਾਣੀਆ ॥੩॥
सभ दुनीआ आवण जाणीआ ॥३॥
Sabẖ ḏunī*ā āvaṇ jāṇī*ā. ||3||
All the world continues coming and going in reincarnation. ||3||
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 27, Line 5
ਦੂਜੈ ਭਾਇ ਕੋ ਨਾ ਮਿਲੈ ਫਿਰਿ ਫਿਰਿ ਆਵੈ ਜਾਇ ॥
दूजै भाइ को ना मिलै फिरि फिरि आवै जाइ ॥
Ḏūjai bẖā*ė ko nā milai fir fir āvai jā*ė.
No one merges with Him through the love of duality; over and over again, they come and go in reincarnation.
Guru Amar Das - view Shabad/Paurhi/SalokPage 31, Line 18
ਲਖ ਚਉਰਾਸੀਹ ਫੇਰੁ ਪਇਆ ਕਾਮਣਿ ਦੂਜੈ ਭਾਇ ॥
लख चउरासीह फेरु पइआ कामणि दूजै भाइ ॥
Lakẖ cẖa*orāsīh fėr pa*i*ā kāmaṇ ḏūjai bẖā*ė.
The soul-bride in love with duality goes around the wheel of reincarnation, through 8.4 million incarnations.
Guru Amar Das - view Shabad/Paurhi/SalokPage 33, Line 18
ਹਉਮੈ ਵਿਚਿ ਜਗੁ ਬਿਨਸਦਾ ਮਰਿ ਜੰਮੈ ਆਵੈ ਜਾਇ ॥
हउमै विचि जगु बिनसदा मरि जमै आवै जाइ ॥
Ha*umai vicẖ jag binasḏā mar jammai āvai jā*ė.
Engrossed in egotism, the world perishes. It dies and is re-born; it continues coming and going in reincarnation.
Guru Amar Das - view Shabad/Paurhi/SalokPage 35, Line 19
ਭਰਮਿ ਭੁਲਾਣਾ ਅੰਧੁਲਾ ਫਿਰਿ ਫਿਰਿ ਆਵੈ ਜਾਇ ॥
भरमि भुलाणा अंधुला फिरि फिरि आवै जाइ ॥
Bẖaram bẖulāṇā anḏẖulā fir fir āvai jā*ė.
Wandering in doubt, the spiritually blind come and go in reincarnation, over and over again.
Guru Amar Das - view Shabad/Paurhi/SalokPage 36, Line 5
ਰਾਮ ਨਾਮੁ ਸਾਲਾਹਿ ਤੂ ਫਿਰਿ ਆਵਣ ਜਾਣੁ ਨ ਹੋਇ ॥੧॥ ਰਹਾਉ ॥
राम नामु सालाहि तू फिरि आवण जाणु न होइ ॥१॥ रहाउ ॥
Rām nām sālāhi ṯū fir āvaṇ jāṇ na ho*ė. ||1|| rahā*o.
Praise the Lord's Name, and you shall no longer come and go in reincarnation. ||1||Pause||
Guru Amar Das - view Shabad/Paurhi/SalokPage 40, Line 8
ਓਇ ਫਿਰਿ ਫਿਰਿ ਜੋਨਿ ਭਵਾਈਅਹਿ ਵਿਚਿ ਵਿਸਟਾ ਕਰਿ ਵਿਕਰਾਲ ॥
ओइ फिरि फिरि जोनि भवाईअहि विचि विसटा करि विकराल ॥
O*ė fir fir jon bẖavā*ī*ah vicẖ vistā kar vikrāl.
They wander in reincarnation over and over again, as the most disgusting maggots in manure.
Guru Ram Das - view Shabad/Paurhi/SalokPage 46, Line 7
ਆਵਣ ਜਾਣਾ ਰਹਿ ਗਇਆ ਆਪਿ ਹੋਆ ਮਿਹਰਵਾਨੁ ॥
आवण जाणा रहि गइआ आपि होआ मिहरवानु ॥
Āvaṇ jāṇā reh ga*i*ā āp ho*ā miharvān.
My comings and goings in reincarnation have come to an end; He Himself has bestowed His Mercy.
Guru Arjan Dev - view Shabad/Paurhi/SalokPage 47, Line 18
ਹਉਮੈ ਰੋਗੁ ਭ੍ਰਮੁ ਕਟੀਐ ਨਾ ਆਵੈ ਨਾ ਜਾਗੁ ॥੨॥
हउमै रोगु भ्रमु कटीऐ ना आवै ना जागु ॥२॥
Ha*umai rog bẖaram katī*ai nā āvai nā jāg. ||2||
The diseases of ego and doubt are cast out; they shall not come and go in reincarnation. ||2||
Guru Arjan Dev - view Shabad/Paurhi/SalokPage 48, Line 17
ਕਰਿ ਕਿਰਪਾ ਪ੍ਰਭੁ ਭੇਟਿਆ ਮਰਣੁ ਨ ਆਵਣੁ ਜਾਉ ॥੧॥
करि किरपा प्रभु भेटिआ मरणु न आवणु जाउ ॥१॥
Kar kirpā parabẖ bẖėti*ā maraṇ na āvaṇ jā*o. ||1||
Granting His Grace, God meets us, and we no longer die, or come or go in reincarnation. ||1||
Guru Arjan Dev - view Shabad/Paurhi/SalokPage 50, Line 7
ਕਾਮ ਕ੍ਰੋਧ ਮਦਿ ਬਿਆਪਿਆ ਫਿਰਿ ਫਿਰਿ ਜੋਨੀ ਪਾਇ ॥੨॥
काम क्रोध मदि बिआपिआ फिरि फिरि जोनी पाइ ॥२॥
Kām kroḏẖ maḏ bi*āpi*ā fir fir jonī pā*ė. ||2||
Engrossed in the intoxication of sexual desire and anger, people wander through reincarnation over and over again. ||2||
Guru Arjan Dev - view Shabad/Paurhi/SalokPage 50, Line 8
ਜਿਨਿ ਕੀਤਾ ਤਿਸਹਿ ਨ ਜਾਣਈ ਫਿਰਿ ਫਿਰਿ ਆਵੈ ਜਾਇ ॥੩॥
जिनि कीता तिसहि न जाणई फिरि फिरि आवै जाइ ॥३॥
Jin kīṯā ṯiseh na jāṇ*ī fir fir āvai jā*ė. ||3||
One who does not know the Lord who created him, comes and goes in reincarnation over and over again. ||3||
Guru Arjan Dev - view Shabad/Paurhi/SalokPage 52, Line 1
ਭਏ ਕਿਰਪਾਲ ਠਾਕੁਰ ਰਹਿਓ ਆਵਣ ਜਾਣਾ ॥
भए किरपाल ठाकुर रहिओ आवण जाणा ॥
Bẖa*ė kirpāl ṯẖākur rahi*o āvaṇ jāṇā.
Becoming Merciful, my Lord and Master has ended my comings and goings in reincarnation.
Guru Arjan Dev - view Shabad/Paurhi/SalokPage 53, Line 6
ਨਾਨਕ ਗੁਰ ਸਰਣਾਗਤੀ ਮਰੈ ਨ ਆਵੈ ਜਾਇ ॥੪॥੩੦॥੧੦੦॥
नानक गुर सरणागती मरै न आवै जाइ ॥४॥३०॥१००॥
Nānak gur sarṇāgaṯī marai na āvai jā*ė. ||4||30||100||
Nanak seeks the Sanctuary of the Guru, who does not die, or come and go in reincarnation. ||4||30||100||
Guru Arjan Dev - view Shabad/Paurhi/SalokPage 57, Line 3
ਨਾਵਹੁ ਭੂਲੀ ਜੇ ਫਿਰਾ ਫਿਰਿ ਫਿਰਿ ਆਵਉ ਜਾਉ ॥੭॥
नावहु भूली जे फिरा फिरि फिरि आवउ जाउ ॥७॥
Nāvhu bẖūlī jė firā fir fir āva*o jā*o. ||7||
If I wander around forgetting God's Name, I shall continue coming and going in reincarnation, over and over again. ||7||
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 59, Line 15
ਆਵੈ ਜਾਇ ਭਵਾਈਐ ਪਇਐ ਕਿਰਤਿ ਕਮਾਇ ॥
आवै जाइ भवाईऐ पइऐ किरति कमाइ ॥
Āvai jā*ė bẖavā*ī*ai pa*i*ai kiraṯ kamā*ė.
Coming and going, people wander through reincarnation; they act according to their past actions.
Guru Nanak Dev - view Shabad/Paurhi/SalokPage 67, Line 17
ਸਚੀ ਬਾਣੀ ਸਿਉ ਚਿਤੁ ਲਾਗੈ ਆਵਣੁ ਜਾਣੁ ਰਹਾਏ ॥੫॥
सची बाणी सिउ चितु लागै आवणु जाणु रहाए ॥५॥
Sacẖī baṇī si*o cẖiṯ lāgai āvaṇ jāṇ rahā*ė. ||5||
They focus their consciousness on the True Bani, and their comings and goings in reincarnation are over. ||5||
Guru Amar Das - view Shabad/Paurhi/SalokPage 67, Line 18
ਲਖ ਚਉਰਾਸੀਹ ਫੇਰੁ ਪਇਆ ਬਿਨੁ ਸਬਦੈ ਮੁਕਤਿ ਨ ਪਾਏ ॥
लख चउरासीह फेरु पइआ बिनु सबदै मुकति न पाए ॥
Lakẖ cẖa*orāsīh fėr pa*i*ā bin sabḏai mukaṯ na pā*ė.
They wander around the cycle of 8.4 million reincarnations; without the Shabad, they do not attain liberation.
Guru Amar Das - view Shabad/Paurhi/SalokPage 68, Line 12
ਜੰਮਣੁ ਮਰਣੁ ਨ ਚੂਕਈ ਫਿਰਿ ਫਿਰਿ ਆਵੈ ਜਾਇ ॥੫॥
जमणु मरणु न चूकई फिरि फिरि आवै जाइ ॥५॥
Jamaṇ maraṇ na cẖūk*ī fir fir āvai jā*ė. ||5||
Their births and deaths do not cease; over and over again, they come and go in reincarnation. ||5||
Guru Amar Das - view Shabad/Paurhi/SalokPage 69, Line 1
ਸਤਿਗੁਰਿ ਮਿਲਿਐ ਫੇਰੁ ਨ ਪਵੈ ਜਨਮ ਮਰਣ ਦੁਖੁ ਜਾਇ ॥
सतिगुरि मिलिऐ फेरु न पवै जनम मरण दुखु जाइ ॥
Saṯgur mili*ai fėr na pavai janam maraṇ ḏukẖ jā*ė.
Meeting with the True Guru, you shall not have to go through the cycle of reincarnation again; the pains of birth and death will be taken away.
Guru Amar Das - view Shabad/Paurhi/Salok

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~~~**Jap mun Satnaam sda Satnaam...sda satnaam sda satnaam.....~~~