You're right about the GHZ thing. The first edition of the book was published in 1994 and it looks like the appendix on the GHZ state hasn't been updated since then.

But this oversight has little bearing on Maudlin's explanation of Bell's theorem, which is, after all, a purely theoretical result. It's an excellent explanation, sophisticated but also accessible. Nielsen and Chuang is a great textbook, but it clearly does not meet the criteria laid out by Luke. A layperson could not just pick up their discussion of Bell states and understand it.