TBH there's a possibility of that, but I like to think he isn't because the first emperor did not hesitate to destroy his family and the earth and forcibly kept him, whereas Tylor/Teller is willingly gave up things to prove himself to be with MC...and even if that is the same soul but as I say in the case of souls, reincarnation/rebirth is only valid if the sense of self is the same, if the memories are wiped and never regained then IMO, they are no longer the same person...
Even if say a person is reborn with the same soul and regain their previous memories much later, as in the sense of self for the reborn soul has already established, then the memories of another life is just that, memories, it may have little to no impact on the present if the sense of self of the present person is more prevalent.
Memories shape a person, without them, they might as well be a different person entirely.