I'm not aware that China can arbitrarily shut down any EVs, let alone non-Chinese EVs. Nor have I heard of the cases you mentioned of dealerships remotely locking people in their cars. That sounds like kidnapping to me.

Do you have any evidence to back either of these fairly remarkable claims?

I'm no fan of Paxton's, AT ALL. But AGs regularly bring suits against companies that have acted badly against the citizens of their state, but have not directly harmed the state. The oxycontin suit against Purdue Pharma and the Sackler family, for instance.