Yeah, I feel like this is trying to answer the question "What is a computer" instead of "what is computer science". Still a really interesting question, but definitely not what I was expecting.

That seems intentional. This seems like it's trying to be a "fundamentals of Computer Science" type thing than actual Computer Science. It's the stuff you need to learn first before you can move into actual Computer Science.

But you don't need to learn how Unix works to understand computer science. If you did, Church and Turing would've been rightly screwed.

That is like saying Socrates is screwed because he never read Kant.