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.

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NobodyNada 6 hours ago | parent | next [-]

LLMs also generally don't put spaces around em dashes — but a lot of human writers do.

	▲	kimixa 3 hours ago \| parent [-]
		I think you're thinking of british-style "en-dashes" – which is often used for something that could have been separated by brackets but do have a space either side – rather than "em" dashes. They can also be used in a similar place as a colon – that is to separate two parts of a single sentence. British users regularly use that sort of construct with "-" hyphens, simply because they're pretty much the same and a whole lot easier to type on a keyboard.

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the_af 6 hours ago | parent | prev [-]

I don't know whether that use of the em-dash is grammatically correct, but I've seen enough native English writers use it like that. One example is Philip K Dick.