These are 'en' dashes. Myself and and other people who care about (micro)typography have been using them since forever.

Presumably the author is one of them. Or they simply use a text editing or blogging software that takes care of it.

E.g. Markdown with smarty-pants feature turned on generates them automatically from '--'. 'Em' dashes require '---'.

Coincidentally Rust's `cargo doc` does this for you -- just for example.

The conclusion that a text containing such micro-typographic niceties must be LLM-generated is a fallacy thusly.

Your other 'evidence' sounds like an interpretation to me. Maybe you should quote the sections you mean?

Otherwise your critique seems superficially limited to form, not contents -- an ad-hominem in disguise one may be tempted to conclude.