I think there is a big difference. This bot is given the text and asked to summarise it. But
To determine which books fit the bill, Exman asks ChatGPT: “Does [book] contain a description or depiction of a sex act?” If the answer is yes, the book will be removed from circulation.
So was only given the title and asked one question about it. There is no saying if GPTChat included the books in question in its training set, or any online reviews or anything else about the book in question.
That is a fairly big difference. If they had fed it the books contents that would likely make it more accurate and closer to what this bot is doing, though still not 100%.