Yeah because they're convinced that this approach of banning high end exports will work to massively slow China down or stop development all together. It's when this kind of technological roadblocks stop working than congress will get desperate and try other methods. I imagine some massive new sanctions weeks after the news that China got their own DUV and even more after they get their EUV.Congress already backed off on a bill to stop purchases of things containing Chinese chips iirc
Probably why it's so important to keep things secret. Even if China got EUV today, they will probably never announce it, even if it's catheric to rub it in to the West. You'll just infer it from the sudden amount of high end chips coming out of chinese products suddenly.