> the em-dashes, the use of ± signs that nobody ever uses

It is a bit saddening that correct punctuation is now a sign of dishonesty. I use em dashes and keep seeing people say it's such a dead giveaway. Now it's also ± which I also use. Are multiplication signs instead of "x" next? Or degree symbols? What can I still use if I want people to not think I'm too dumb to write my own text

You mention more signs (semantics, choice of what to embolden) but they're not binary signs (present → it's generated) and basically guesswork