Economics

The Chinese will destroy them

Largely because they can sell at or below cost and still make a profit, because they're being propped up by the Chinese government.

Domestic production is the legitimate use of tariffs, especially when the target country is effectively hacking their prices lower through subsidies. China wants to Walmart green tech. They want to artificially lower their prices until they've driven out all competition permanently.

Just like how Canada's high tariff on US dairy after a certain limit was valid because they want to retain some of their own production. And the US could literally drown Canada in milk.