The Programmer Identity Crisis

Whenever I see an em dash (—), I suspect the entire text was written by an AI.

That says more about your lack of writing skills and understanding of grammar than AI.

That's simply not true, and pointlessly derogatory.

This article does not appear to be AI-written, but use of the emdash is undeniably correlated with AI writing. Your reasoning would only make sense if the emdash existed on keyboards. It's reasonable for even good writers to not know how or not care to do the extra keystrokes to type an emdash when they're just writing a blog post - that doesn't mean they have bad writing skills or don't understand grammar, as you have implied.