Those clauses are unenforceable 99% of the time and nullify that version, and all future versions, of the contract. The only clauses like that that are considered enforceable are ones that cover very minor changes or those required due to changes in law.

Americans don’t even use it any more; it came before there was an international version so it’s kind of silly to treat it like some weird ‘america different’ thing.

Russia still uses their version, especially in the navy.