Considering how much of what we have is made in china in the first place, how can they not already have all the tech they need? I assume if they can't get fast

Considering how much of what we have is made in china in the first place, how can they not already have all the tech they need? I assume if they can't get fast US devices they'll just use the US designs we give them to make whatever they need on their own dime, likely to sell for less than the prices we'd be demanding.