> art is art if and only if it was made by humans, end to end

I disagree with your definition of art. One can use AI as a reference and the end result will still be art because it'll carry execution technique and the subjective perception of the artist. Saying otherwise would be like saying that electronic music isn't music because it's a computer producing the sound waves.

A better candidate would be "an object can be a work of art if and only if it wasn't made by machines end to end".