There is artistry in assembling other art into a single cohesive piece. A film is a collection of the work of artists and performers. Combining AI imagery and AI text together does not make art, because none of the constituent parts are art. A few prompts do not make art.
Is a painting not art because individual pigments aren't art?
Writing a blog post is a creative effort, selecting a few pieces (generated or not) is creative, too, whether it is up to your standards are not.
The gatekeeping on this is crazy. I really wonder how artists discussed photography and other advances.