>Art is an expression of human emotion
Yet humans are the ones enacting an AI for art (of some kind). Is not therefore not art because even though a human initiated the process, the machine completed it?
If you argue that, then what about kinetic sculptures, what about pendulum painting, etc? The artist sets them in motion but the rest of the actions are carried out by something nonhuman.
And even in a fully autonomous sense; who are we to define art as being artefacts of human emotion? How typically human (tribalism). What's to say that an alien species doesn't exist, somewhere...out there. If that species produces something akin to art, but they never evolved the chemical reactions that we call emotions...I suppose it's not art by your definition?
And what if that alien species is not carbon based? If it therefore much of a stretch to call art that an eventual AGI produces art?
My definition of art is a superposition of everything and nothing is art at the same time; because art is art in the eye of the arts beholder. When I look up at the night sky; that's art, but no human emotion produced that.