How does hynotic regression provide evidence for reincarnation?

From: Devdatt: In one of your books as a proof of reincarnation, you mentioned about past life regression, which I think is like going in the past literally.  This seems really challenging to intellegence to accept as truth because once the things has happened already how can one go and see it , is already past. at this stage before I get the answer past life regression logically impossible.