This is an indication of how important others see this market going forward. With backing from the Chinese government they'll be able to dump cars at a loss and put Tesla out of business, then they'll own the market... unless somebody with a set fights back and imposes tariffs to stop the dumping.
Yes someone can impose tariffs and then take them back and impose them again. All auto makers should be scared not just diversified ones like Tesla because everyone in the US wants a Chinese car. I expect this to crush Tesla by next year.