That’s just using words to try to argue against a reality that is what you’re saying can’t happen. If US regulators can control access, preference, stamp coins, coerce miners and exchanges it is a cbdc in all but name. And if they go really far, they can effectively issue more coins through a hard fork or potential control of pools/ hash power. The onus would be on the forked/ outhashed minority to establish their version of bitcoin as the real one, when the exchanges, miners, pools, treasuries and regulators are all against them. This wouldn’t be an easy fight and you could argue it would be an unwinnable one.