I'll play devil's advocate and say there are non-AI render processes that can miss a horn (e.g. working from a clay model and scanned, for instance). Hell, even a lazy wand picker in Photoshop can lose a horn! I'll even say that the very-AI looking 2D illustration can simply be a byproduct of a lack of creativity and the fact this is clearly shovelware. I lived through the Wii era, I can attest that shovelware can look this bad without AI, lol.

HOWEVER, it sure as hell looks like AI generated artwork and they could do a lot better defending their process. The irony is ... I don't really think the trailer is AI? It's... honestly too unpolished and weird to be? Every effect used is something I'm certain I could do myself, lol.