> reproduce books word by word, page by page

This statement is a figment of the commenters imagination with no basis in reality. All they would have to do is try it to realize they just spouted a lie.

At most LLMs can produce partial excerpts.

LLMs don’t store the data that it’s trained on. That would be infeasible, the models would be too large. Instead, it stores semantic representations which often uses entirely different words and sentence structures than the source content. And of course most of the data is lost entirely during this lossy compression.