I didn't see any references in the article you linked to any cases where it had been enforced. I see a lot of commentary that validates the concern, and a listing of half a dozen states where they are being struck down.

So the callout to be wary of them is totally legit... but it doesn't look like they are going to be enforceable when such things go through the courts.

Yeah the warning is: you may, like me, find a litigious paranoid former employer who freaks out at everything :-/

I’d rather not carry the cost of learning it’s not enforceable.