I think you're misunderstanding me. DCU continuity is now a giant buffet that creators and fans can pick and choose from to make any history you'd like. If you prefer the Roy Thomas origin, you can use that, whereas as I have stitched elements of both together.
Continuity is no longer some religious text in which some parts are excised and considered apocryphal. What the repeated attacks of The Anti-Monitor, The Time Trapper, Extant, Parallax, Superboy-Prime, Alexander Luthor, the Dark Multiverse, and Dr. Manhattan have accomplished is making DCU history so fluid that the promise of Hypertime is now real and the official policy of the main architects of the DCU.
Everything happened. It's all canon.