I think the truth of the reveal is that Palpatine did indeed do something to create Anakin and Rey, but in reality they were a counter to whatever he did, and are just creations of the force. Palpatine then believes that he is their creator because he’s narcissistic and thinks that he has complete control of the force. That way, the canon timeline of events lines up. This can all stay ambiguous, though. The dialogue we have now doesn’t refute this either, so idk if it warrants a change.