To be fair, LLMs usually use em-dashes correctly, whereas I think this document misuses them more often than not. For example:

> This can be extraordinarily powerful for summarizing documents — or of answering more specific questions of a large document like a datasheet or specification.

That dash shouldn't be there. That's not a parenthetical clause, that's an element in a list separated by "or." You can just remove the dash and the sentence becomes more correct.