You could make that argument about humans who look at other stories of art before creating one of their own, influenced by the others then.

Let's say I give an AI a prompt to create a picture of a cute puppy of about six weeks old, but as large as a building, and instead of paws, each leg ended in a living rubber ducky the size of a car, and the puppy is squatting to poop, but instead of poop coming out, it's the great men and women of science like Mendel, Pasteur, Nobel, Currie, Einstein, and others, all landing in a pile. Oh, and if like the picture to be in the style of Renoir. I think we could agree that the resulting picture wouldn't be a copy of any existing one. I think I'd feel justified in calling it original content. I've seen a lot of hand painted works that were more derivative of other work, but that people all agree is OC.