I have serious misgivings about this sort of "hush money". In general, I'd prefer not to interfere in private contracts, but this one has such serious implications for everyone else. In particular, it can end up creating an information imbalance, enforced by the courts, that allows a certain group of people to remain "in the know", with everyone else unaware of what is going on. I read a while back about a law firm t…
One could argue that such cookie-cutter contracts are no longer "private" if they're presented to the employee as the industry's standard operating procedure. I don't know if such an argument would hold legal weight, but there's something wrong with an agreement where it's expected that only one side gets to decide what's being agreed to.