This is a debate that existed long before LLMs with things like action painting. If I give you a Jackson Pollock and a piece from someone who randomly splattered paint on a canvas until it looked like Jackson Pollock, are they the same?
As an aside:
...art should be able to come from anywhere and anyone.
is an immensely political view (and one I happen to agree with). It's not a view shared by all artists, or their art. Ancient art in particular often assumes that the highest forms of art require divine inspiration that isn't accessible to everyone. It's common for epic poetry to invoke muses as a callback to this assumption, nominally to show the author's humility. John Milton's Paradise Lost does this (and reframes the muse within a Christian hierarchy at the same time), although it doesn't come off as remotely humble.It was the intellectual statement conveyed through that medium that made him famous.