Most of this is recontextualisation, not appropriation. Even the Lichtenstein is covertly ironic. The creativity isn't just in the imagery and the technique, it's in making a statement about the surrounding culture.

AI doesn't recontextualise, it reproduces cliches. You could argue that AI itself is an original artwork. But its output is backward- and inward-looking, not forward-looking. It tries to reproduce work from the past in a very literal way, mostly for users who are culturally naive and think art is about pictures, not about cultural, emotional, perceptual, and psychological insights.