Are the subsidies specifically for destroying foreign markets? (😈MWAHAHAHAHAHAHA!)
Maybe, maybe not. I'm not a huge fan of the Chinese government, but I don't think their subsidies program are intended to directly destroy foreign markets so much as put the country at the forefront of development and production... which can be perceived as the above.
In depth study of the Chinese GreenTech subsidy system.
As the study goes into in depth, tax credits are just one part of the system. There's also direct subsidies(funding) for R&D, which is understandably very expensive, and below market value land sales among other things. In 2019 China put the equivalent of 1.73% of their GDP into industrial support, with below market land sales being a substantial portion of that. Next highest on the graphic is Korea at 0.67% GDP equivalent.
Moving away from the subsidies thing.
China has the battery production technologies and capabilities, the electric motor production, an unbelievable economy of scale, and insane levels of automation in their EV Factories,
(Found this out awhile ago when I was watching a video on how actually ridiculous the whole US - Greenland thing was.)
China has ~90% of the rare earth refinement capacity. Even if Trump wants/wanted Greenland for it's resources, it would be over a decade to spin up enough refinement infrastructure to process whatever they would hypothetically extract.
China has invested HEAVILY in the entire supply chain from resource extraction to final product for a wide swath of GreenTech. When a lot of the rest of the world has switched from a majority production/export to majority consumption/import economy, or focused on soft products/research/etc of course they would see a country flooding their markets with products as adversarial. Regardless of if those foreign products are superior. Especially if the government of said foreign country is often interfering in political processes, intimidating other countries citizens, setting up extra judicial secret police networks in many countries, economic coercion....etc etc etc.
I'm not entirely convinced that the subsidy system is malicious, but the CCP isn't above playing dirty. So I can fully understand the common reaction being that it is.
That's one of the advantages of having a single party in power for a very long time, I don't think China qualifies as a proper dictatorship, but it shares the advantage of the ability to plan decades in advance. The US is hobbled by the 4-8 year cycle of the next person totally erasing all the work of the previous. So there's an incentive for whoever is in power to keep the status quo and keep any changes small enough or "bipartisan" enough that the next person doesn't repeal it.
I wouldn't necessarily say that from what's visible outside the information confines of the CCP is cheating. They have a well defined goal, and no sight of the end of party rule means they can effectively do whatever they want to achieve it.