And what exactly does AI have to do with national security? I don't think the H100 has achieved the computational power needed to create a T-1000, nor do rockets, tanks , warplanes require supercomputer AI. Sure, computer vision requires AI, but old generation chips are entirely sufficient for that. Military applications require sensors, not chips for natural language processing. And it's not like it's the Chinese government who are the ones buying these chips.
Not to mention that you can still build supercomputers out of older chips, you'll just need more of them, so the cost is higher. And FPGAs can achieve the same ML performance, it's just that they're not as easy to work with. Hence if they were truly being sourced for military purposes, the US should ban all modern chips. The argument is nonsense, and as mentioned, IMO it'll only cause conflict instead of resolve any.
Edit: If you really want my take, the whole ban is entirely about gaining leverage over China to minimize the amount of support they provide/offer Russia. I wouldn't be surprised if they revert the ban if/when the Ukraine war ends.