Quote Originally Posted by Frontier View Post
No, but the showrunner said it in an interview that it was the case.
That's a paradox. Arrowverse Jay was Henry Allen's doppelganger, and Joan is Nora Allen's, which means if Jay and Joan exist, Henry and Nora shouldn't have ever existed - which would mean Barry wouldn't either. All the doppelgangers are supposed to be gone, as though only one ever existed.