I wouldn't expect an AI to know exactly what happens in every chapter of a book.
Knowing the plot of Neuromancer isn't the same as being able to recite a chapter by chapter summary.
I tried this Neuromancer query a few times and results greatly vary with each regeneration but "do not include spoilers" seems to make Gemuni give more spoilers, not less.
Not really- if you had examined the output closely you probably would have seen noticed it conflated chapter 13 and 14 or 14 and 15. Or you got very lucky on a generation. It definitely doesn't exactly know what happens in each chapter unless it has a reference to check.
Knowing the plot of Neuromancer isn't the same as being able to recite a chapter by chapter summary.
I tried this Neuromancer query a few times and results greatly vary with each regeneration but "do not include spoilers" seems to make Gemuni give more spoilers, not less.