To a certain extent I agree, but another argument would be that at the end of the day, computers are deterministic (even on the incredibly large scale of these image generators, given parameters x, it will produce y).

We're still not sure whether humans are deterministic or not. So you can't really equate the human process of art creation to a computers. Humans may still be pulling from some external inspiration that will never be within the reach of computers (I like to think that's the case).