Deutsch was mistaken, at least on that specific issue of the uncomputable reals being a fundamental limitation on Turing machines doing physics: https://michaelnielsen.org/blog/interesting-problems-the-chu... It’s also incidental to the overall discussion, Deutsch was simply postulating about a limitation in Turing machines (in the same way that deterministic finite automata are fundamentally limited in the class of problems they can solve).

I don’t necessarily feel like arguing further about this tiny issue, or a distraction about your misconceptions regarding quantum computing[1]; this problem has been widely discussed since Deutsch and there are plenty of sources out there. The point is that it takes a huge cognitive leap to suggest that consciousness is either fundamentally spiritual, or part of a (hypothetical) class of physics problems that can’t be solved by a computer.

[1] Quantum computers are real. You are confused by news stories about private companies with outlandish claims of powerful quantum computers. In physics laboratories, small quantum computers have existed for a few decades. Typically they are too small to do anything useful (I saw one in person that could factor any positive integer... if it was less than 15).