Certainly but this can also be viewed as helping ease the transition for automakers since they've also implemented stricter efficiency rules upon them at the same time.
If we assume China is subsidizing $15k per car to allow them to sell for $10k, that $12B in US subsidies equates to about a single quarter worth of sales for just BYD alone, or 800k cars. There is no way we can match those subsidies for the rest of the players in the American market as around 13.5 million new cars are sold in the US each year.