We all use data. Music is vibrations in the air that our eardrums convert into electrical signals sent to our brain. We like it or we don't. No different from an ai.
I would see it more like plagiarism rather than writing. It is just a fancy copy-and-paste machine.
I find the latter quote makes more sense to me. Again I think it's a good discussion.
I am pretty ardent in my avoidance of Ai slop music though.