But you were talking specifically about a static medium, not video or music, which are not static mediums. We were also discussing image gen AI, not video gen etc.
Most people also don't consider video or music edits collage either, and call them something else. Because they use different skills and are different mediums.
Also, you do realize we're still talking about current AI generation right? There doesn't exist an AI that executes processes on it's own (maybe) yet. So your whole thing wasn't relevant either, really, in any way more than saying a piece of paper will spontaneously draw something on itself.
That said, you can, using prompts, training, guidance steps, etc, actually do exactly what you did in a digital format, using a diffusion image generation AI. You can get more specific by using it + Gimp.
Edit: and I mean, you still are using someone else's art to create what you made.