I stand corrected with others wisdom.If I am understanding the article correctly, the gurus expressed divine reality in terms of reincarnation even though that reality may not exist.
The Gurus have to deal with people and beliefs of the day. As such they related and used symbology for certain aspects including reincarnation, 8400000 possible varieties of life, etc. This symbology has been mis-associated as though Guru jis attested to its validity for Sikhs. The truth cannot be more further. Sikhism believes in here and now living in consonance with creation and understanding creator and creation is the goal towards this end.
Since this reality was expressed as such, many in the Sikh religion advocated this and many still do so to this day. In today's world, with the advances in knowledge, the Sikh religion does not advocate reincarnation as a formal teaching.
The notation has been mis-recognized as a reality and a belief by so inclined. However it does not make that the Guru jis taught such.
Does this sum up current teaching in this area? Are Sihk's free to accept or reject reincarnation? Are they encouraged to advocate for or against reincarnation? Or perhaps it is an optional teaching where one is free to believe in it or against it and remain a follower of the Sikh faith?
If a Sikh follows Guru jis teachings, one cannot be accepting of re-incarnation. Continuity of life in a family, your impact on other people while alive or dead are all possibilities but the indivisible soul leaving one body and being in another as such is not in the teachings.