Quick browse through pre-AI works from John Paul II show em-dashes present.
One of the big problems I see currently is all the wild accusations being thrown around by seemingly half the internet that every little thing has been AI manipulated upon the tiniest suspicion. We will go mad tearing each other apart if we keep escalating this behavior.
Yes, some of it is blatantly obvious, but not to everyone-- so I think those casting aspersions need to really back up their claims with more than one or two bits of 'evidence'. I have been accused of using AI to write comments (which I have thus far never done), and I know I'm not the only one by a long shot. Such a waste of time and energy. Ignore it and move on if something smells off to you.
Also I am just so, so tired of the em-dash argument. Humans have been using it for a looong time. Let it go.