Hypothesis C: failure of human memory. A human read Stephenson's book(s) 20 years ago, remembers that the endings were a bit unsatisfying. The same human also read some other book many years ago, which ends mid-sentence. In that person's mind, the two are conflated.
If I was writing a book review for my company (big famous VC who cares about their reputation) - I would’ve probably at least popped the book open and read a few chapters if it’s been years since I read it
Another hypothesis. Have AI generate a top 50 list of books, and add a book you want your website to promote into the mix somewhere near the top to increase its sales. Cheap marketing, It wouldn't be the first time.