Art is like a lossy compression algorithm. If there is a soul of any form the only reason you think you're observing it in human-produced art is because your decompression algorithm is adding it.

While I don't disagree there's a "human touch" to art, I'm not convinced it can't be synthesized to some degree. It may not be innovative, but I think since AI is extrapolating from learned data, it can at least mimic the current pop culture.