Heroic Hollywood is barely above WGTC and Cosmic News, so I wouldn’t put too much stock in what they have to say. Supergirl has apparently been put on hold which is no surprise, we haven’t heard a thing since the initial rumor after all, and apparently WB has decided to refocus on Superman which *might* mean Cavill can come back. But there’s been nothing concrete.
Got a TL ; DR for the video? I suspect it’s all bunk but what the hell, I could use some entertaining rumors. I doubt Grail will be in WW3 though, personally I’m hoping for Circe.