I’m a little skeptical that it’s AI generated because a lot of those details could be the result of kitbashing, which is especially common with concept art (here’s an example from Guild Wars 2). It could be they just grabbed a piece of concept art, slapped some promo stuff on top of it and called it a day. That said, considering how much of a hard-on Hollywood has for AI, I wouldn’t put it past them to generate promo art with an AI.
I wasn’t planning on watching it anyway, but I wanted to throw in my two cents.