Indeed. In English it is an em-dash. Not brackeded by spaces, although you should bracket by thin spaces to make sure you get some separation, optically. And line breaks in apps that are unaware this is a separator.

In many other languages ideas are separated by en-dashes (surrounded by spaces).

In the case at hand the use of en-dashes in English text instead of the correct em-dashes could also be a sign of a non-native speaker caring about micro-typography and just doing the wrong thing. :)

The LLM conclusion doesn't seem well supported either way.