I think it's possible that it was set out somewhere. But most likely it's just a legend.

It's literally confirmed by Rockstar that Revolver and Redemption are separate canons, therefore he does not physically exist in the Redemption universe. It's not disputable, so it shouldn't come as a surprise that many people are sick of this question.

Yeah, what the based person said!

Well in RDR2 a guy mentions Red Harlow that he's heard the stories of his adventures, that's why I created this poll

Rules of the Red Dead Wiki:

1. If you can't find any physical evidence that supports your claim, then it's HEARSAY!

Ok