Indeed. It's a cool project, but I don't think this is a great success metric. A better metric would be to have a human composer do the same task, and have audiences judge whether they like the human- or AI-generated result better.
If you wanted to know if they liked the music more, you could play any modern song and it would probably score higher, and I say that as a classical music fan.
To give an example, I would always go to a Mozart concert if the chance comes up, despite me not really liking his music a lot, there’s still no denying that they’re musical masterpieces and provide more than nice sounding tunes.