This seems to be the crux of the argument. People are saying that the definition of Art is "something created by a human", ergo, it is impossible, by definition, for an AI to create art.
The counter to that is the AI is created by humans, and in that respect is no different to a paintbrush. The humans who created the AI are the creators of the Art.
Personally, I don't think there is a commonly accepted definition of what is and is not Art, and therefore arguing about it is a pointless waste of time, so I will post no further in this thread.