Fair enough.
I wouldn't take it well if some guy just dropped in and went "oh btw y'all are fakes here's proof I'm gonna go become god now."
So him keeping that secret is less selfishness and being embarrassment of his past life and more that this would affect his current life far too much and...
Looks pretty good the basic premise being able to wander around a world of your own creation as one of it's inhabitants is pretty neat
Hopefully it doesn't fall into the cliche pitfalls...
I kinda expected the momotarou groups to be more in a grey area because of the MCs dad and such but like... The author is REALLY driving it in thick huh? Like i wonder if the child genocide 9000 is the bad guy