I hope you don't get bothered by people wildslinging AI accusations :'). Goshhh imagine pouring your heart out to your work and then getting accused by people who don't have the capacity to assess AI-use and rely on lazy generalizations such as em-dash usage.
Like, even if AI uses em-dashes, there is no intentionality to it compared to an actual human making writing decisions.
Something I personally notice in AI generated stuff is that they overuse it and usually use em-dashes even when a colon, comma, or semi-colon would make a better fit to the sentence structure