This wouldn't prove consciousness is physical. I'm not saying I'm a dualist, but pragmatically, the only thing I can say is that I'm conscious. It doesn't matter if scientists showed me a conscious computer, that event is still happening in my consciousness. Why believe a computer the computer is conscious, when I can't even prove other humans are conscious?

I don't necessarily believe the above, but no one mentioned this point.

Also, the multiverse makes this an odder issue. If the simplest algorithm is to output all possible universes, what's stopping a universe from having just one observer?