That's a great point! I wonder if the difference might be that, as you mentioned, Hirst's lack of direct involvement was part of his artistic message. I wonder "work where the medium is part of the message" might just be an exception to the rule? Although in general I am suspicious of whether AI art is really art, I would consider it art if using AI was part of the message. However, does that generalize to other messages that people use art to communicate?