[ozy]

> But in this world, consciousness is, at root, a physical phenomenon, not a purely computational phenomenon.

That is entirely unknown. If it were a purely computational phenomenon, it would explain a lot, and nothing in this article argues against it. Except, perhaps, the iron bar mapping. But it seems to miss that a computer program basically defines a causal network. And recognizing and comparing causal networks is much more objective then the thought experiment acknowledges.