I've seen examples of an employee contract, with things like "if any piece of this contract is invalid it doesn't invalidate the rest of the contract". The employer is basically trying to enforce their rules (reasonable), but they have no negative consequences if what they write is not allowed. At most a court deems that piece invalid, but that's it. The onus is on the reader to know (which tends to be a much weaker party).
Same here. Why can a company send a threatening letter ("you'll go 20 years to federal prison for this!!"), when it's clearly false? Shouldn't there be an onus on the writer to ensure that what they write is reasonable? And if it's absurdly and provably wrong, shouldn't there be some negative consequences more than "oh, nevermind"?