I want to provide a counter perspective, which is that I am very happy with way in which the website deconstructs the book into short "articles".
What I mean is that I think this website (at least from my perspective) has a successful, novel approach to representing books on the web.
I don't mean to discount your point. UX issues are very serious and can ruin an otherwise carefully presented work. My point is that despite these issues, I am impressed by the creator's approach to the website.
It renders as individual pages for me. An article (as in one html page) per chapter would probably be easier to read. Now they've forced constraints onto it that makes sense for paper but not a website
What I mean is that I think this website (at least from my perspective) has a successful, novel approach to representing books on the web.
I don't mean to discount your point. UX issues are very serious and can ruin an otherwise carefully presented work. My point is that despite these issues, I am impressed by the creator's approach to the website.