Yeah I got the take from “to communicate to his team” was aka kinda “pre-storyboarding” to illustrate his concepts to a team of creatives which eventually will include real storyboard and concept artists. If it’s just a tool for a writer/director who doesn’t really do concept art to help a real professional in that field hone his ideas, that’s an acceptable use of AI imo. Just as long as none of it actually is used in the storyboards/concept art.