The point being made in the “On Functionalism” section is more fundamental than that: namely, thermodynamic bounds like the Bekenstein bound rule out infinite-information hypercomputation in physical systems.
Then Turing universality matters because once the relevant causal dynamics are finite/computable, the same organization can in principle be realized across substrates. No extra observer-relative “simulation” semantics is doing the work.
The point being made in the “On Functionalism” section is more fundamental than that: namely, thermodynamic bounds like the Bekenstein bound rule out infinite-information hypercomputation in physical systems.
Then Turing universality matters because once the relevant causal dynamics are finite/computable, the same organization can in principle be realized across substrates. No extra observer-relative “simulation” semantics is doing the work.