You won't be able to tell the difference when you go picture frame shopping at IKEA, sure (you could probably even have an on-demand printer which generates art suited to your needs). But you won't be able to invite the AI for an interview about the meaning of its art either. I think someone feeding an AI with movie titles and arranging it in an interesting or meaningful way becomes an artist with the AI as their work material.

Just like chess AIs are the result of human work by the way. I don't know if there is a league of AI chess, but if there were, you'd always have the developer teams behind them who make strategic decisions on how to develop the AI. They become chess players of another kind but chess players nonetheless.