If Chinese EVs were to be sold widely in the US, they would be less than half the cost of any Western-made EV and would take over the EV market. A future where Chinese companies own the EV market in the US with all of the American user data going back to servers in China- that's just not a future the US govt. wants- no govt. (outside of China's own) should want that.
Then there's the whole Fentanyl epidemic in the US and elsewhere. That is largely due to Chinese chemical manufacturers who are selling the chemicals to Mexico and then those drugs are smuggled into the US. There are many to blame here but the US has been pushing China to ban the sale of these chemicals outside of China for a long time without agreement. China realizes this is important to the US and it's being used as a key trade issue.
"doubling down on liberal democracy" got us to where we are now wrt China. China doesn't respond to liberal democracy. They only respond to force or trade embargos, or tariffs. That's what was learned as Xi decided to become dictator for life.