Yeah, pretty much saw this sort of thing coming as soon as he started messing with a Father box, and doubly so when he dared to use the name Grayven. That was possibly one of the most bone-headed moves Zoat's SI has done in any of the universes we've been shown, especially since he should _know_ about Darkseid from the start, and about clearly seems to have known about mantling at least on some level. Sure, short term, becoming a new-god looks really shiny, but long term, becoming an Apocolyptian one means you are completely screwed due to encounters like this.
I was curious why he'd even tried it, given that he should have known this would happen, and I haven't really seen a worthwhile justification, so I'm hoping we'll either get one in an upcoming chapter, or some revelation of evidence about how mentally screwed up he'd been when he made the decisions that led to this point, now that we've finally reached it.