I'll throw you a bone and say that, if/when AGI rolls around, I'll be more than happy to extend concepts like creativity and artistic ability to it. I'll throw you another bone and say you're technically not wrong either.

The question I've come to is less about what is "original vs remix", and instead, "sapience vs machine intelligence". If sentience is the ability for an individual to say, "I think, therefore I am", then sapience is the ability for an individual to figure out that "I think, therefore I am". Furthermore, in this context I define "machine intelligence" as something artificially created which demonstrates elements of sentience or even sapience but fails to meet all the criteria that we would consider necessary for human intelligence (basically machine intelligence is "fake" intelligence).

AI at its current state appears to be nothing more than machine intelligence. It looks cool, it can fool you pretty good, however, in the end it appears to be about as conscious and self-aware as a jellyfish or siphonophore.

Furthermore, the AI doesn't have the ability to create unique experiences. It doesn't have the ability to walk out the door, drive down the street, walk into a surf shop and buy a surfboard. Even if we say, "putting it in a robot is too hard, we'll just put it in VRChat instead", I still have strong doubts about whether or not the AI is actually experiencing anything.

I mean, it can't even learn from itself without human intervention ffs. Unlike a human, you can't train an AI while it's running. Unlike an AI, humans don't ever fully shut off until we're dead (no, your brain doesn't turn off when you sleep; if it did then you'd literally be dead).

So you're not technically wrong, but at the same time AI brings nothing new to the table. It doesn't have new experiences it can mix in with the artwork it was trained on, nor is there evidence that it'd be able to control or shape what it experiences. While I hesitate to attach the physical act of creation to the concept of creativity (I consider creativity to be separate from artistic skill), a large part of creativity is coming up with something new based on a combination of your own experience and the experiences of others. Whether or not you act on your creativity and how well you execute your idea is immaterial.