From OP but I'll elaborate:

In case the joke is not obvious: While in universe, this is technically "AI art" in the sense that Data (who is an artificial being) had painted it, in reality, that episode came out in 1993, so that prop was undoubtedly painted by a human.

Data is a unique android built by master android crafters; who designed him specifically to be humanlike. Data's makers were killed and Data was rescued by starfleet. HIs character arc throughout The Next Generation is him becoming more human while audience gets to examine human experiences through a different lens.