Trump is doing what Trump does. All these accusations coming before the now declared September summit in the US between Trump and Xi is the typical tactic of creating new points of tension to be negotiated so that if successful means the US didn’t give away anything while hoping to get more from what they always aimed from China.
I’ve heard that US attempts at an alternative rare earth supply source is only revealing how much more it’s going to cost the West than previously thought. It hasn’t changed how much dependent the US and the West is on China’s rare earths supply. Banning free Chinese AI where China isn’t making the money isn’t leverage in negotiations but it’s enough for China to put restrictions on the US.