You meant Bill Gates’ 640KB, or is this related to the Commodore 64?

a ‘masterpiece’ is a very subjective term. Most are viewed as such not because of some objectively measurable quality but because of their uniqueness/originality (at the time) and context. In that regard it’s hard to imagine AI could achieve that until it became very good at imitating humans.

claiming it will match humans feels more like emotional wishful thinking

It's basically a religious argument that realistically can only hold if there is something in the brain which violates known physics and allows for a category of computation that isn't just different, but different enough to be impossible to emulate within known physics.

Otherwise the brain can't compute anything a computer can't (eventually) emulate.

Maybe it's possible - as an atheist I find that near impossible to imagine, but I won't entirely dismiss the possibility, but I doubt it.