Chinese EV makers have a few interesting technologies especially wrt. batteries but they're still very far from catching up to the frontier in a general sense. From that narrow POV Musk was absolutely correct.
What the hell are you talking about? They have batteries that charge 0-80% in 5 minutes even at -30F. More full featured EVs at half the price with similar acceleration rates and higher top speeds. Total ranges are comparable or better. What is this frontier you speak of? I think the only thing US companies are far ahead on is self driving.