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cousin_it comments on Metaphilosophical Mysteries - Less Wrong
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AIXI with a TM-based universal prior will always produce predictions about the black box, and predictions about the rest of the universe based on what the black box says, that are just as good as any prediction the human can come up with. After all, the human is in there somewhere. If you think of AIXI as embodying all computable ways of predicting the universe, rather than all computable models of the universe, you may begin to see that's not quite as narrow as you thought.
That took two days to parse, but now I understand how it works. You're right. I apologize to everyone for having defended an incorrect position.
My misconception seems to be popular, though. Maybe someone should write a toplevel post on the right way to think about the universal prior. Though seeing that some other people are even more hopelessly confused than me, and seem to struggle with the idea of "prior" per se, I'm not sure that introducing even more advanced topics would help.