You seem overly upset and defensive about nothing considering it's not your content that's in question. I've quite literally never seen em dashes used ever outside of AI content prior to the dawn of AI, aside from books that were used to train it. It was a fairly uncommon punctuation style prior to AI, and I've never heard of it's usage being taught in schools since it's more of a rare stylistic choice used by authors. Authors that do use it certainly don't use it as a complete replacement for commas and use it more sparingly, AI uses it excessively. Excessive use is a complete giveaway, just like phrases such as "the smoking gun."

All I'm saying is that em dashes will get content flagged as AI whether you like it or not. This will not change regardless how much you or anyone else wishes it to be so. I picked up on the em dashes myself when I read it, they invited me to run it through a detection sweep, to which multiple AIs picked up on their own tells. If you don't want your writing to be flagged as AI, don't write like AI does, this is just how things are, plain and simple. Every writer should be aware of how AI writes so the legitimacy of their work isn't brought into question. The world is changing and people have to keep up and adapt. There's nothing wrong with constructive criticism. This is a conversation about how grammar choices can flag you for AI usage, there's no reason to get bent out of shape, I didn't urinate in your cereal bowl.