Prohibiting the sales of advanced products is easy for the US government to do because all it requires is legal power and no investment. Exporters bear the short term cost.
On the other hand, building alternate supply chains, however many laws and and speeches are made, is really, really hard.
Recently dumb slow Iranian drones have decimated Ukrainian power infrastructure in a few short weeks, the most advanced component being off-the-shelf GPS chips manufactured in China. Now imagine what China could do with modified cheap commercial drones manufactured by the tens or hundreds of thousands.
In contrast, there are no real battle ready AI weapons so far - the practical uses are so far mostly about domestic control and China is already the leading user in that field.
Xi is testing out his war time domestic control - simulated with COVID lockdowns - to make sure the state is battle ready. He'll keep his center of mass low when push comes to shove, relying on low end good enough weapons in enormous quantities. China is already food self sufficient, and Russian hydrocarbons ensure a supply of fertilizer and fuel.
There is a long and difficult road ahead for the West, big painful changes. It is a mistake to think of these sanctions as a victorious offensive - actually it is a rushed defensive retreat - like blowing up bridges - as the first step in a very long and painful struggle.