Consciousness is Fundamental So anyway, the claim now from you is, if physicalism is true then knowing everything about the physical arrangement of the book should allow you to understand the meaning of the book, even if you don't understand the language it was written in.
I just don't think that follows.
I mean, let's take LLMs as an example. They're a good example because they're explicitly physical. They are implemented 100% in the physical world - the computer scientists who invented them didn't learn how to imbue them with souls or anything, they work on the same physical principles as any normal computer.
Now if you give one of these LLMs a bunch of text in a language they're trained on, they can summarise it for you pretty well.
And if you give them a bunch of text on a language they haven't been trained on, they can't.
So we have a fully physical system which can, loosely speaking, "understand" some stuff and not "understand" other stuff, despite having the same access to the visual characters of each text. So... no I don't think it holds that, if physicalism is true, a person should be able to understand text he hasn't been trained to understand.
Obviously LLMs aren't the same as human beings and a summary from the LLM isn't the same as human understanding. BUT the ability to summarise and paraphrase a text is a human test for understanding, so I think the comparison is honestly robust enough.