They’re also spreading this nonsense at my hospital where we’re actively organizing right now. It preys on people’s ignorance of how legal contracts work.

Your lease doesn’t guarantee that your landlord won’t violate its terms either. But it does give you the ammunition to take them to court and win compensation, if they do.

The same applies to a union contact. It’s legally binding in the same way. Sure the company technically can violate the terms of that agreement. But the union is going to escalate the issue to the NLRB and/or sue them in court, if they do. And you will win, if you provide the evidence that they violated the legally binding contract.

This is what disingenuous corporations call “not guaranteed”