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

Hypothesis D-for-Delany: The human thought Stephenson wrote Dhalgren.

"Waiting here, away from the terrifying weaponry, out of the halls of vapor and light, beyond holland into the hills, I have come to"

Hypothesis A is much more likely if you ask me