That does not explain DeepSeek, nor does it explain the car industry.
The main advantages the Chinese car industry has right now are: they lead in battery R&D, production is highly automated, they iterate quickly, Chinese work culture is extremely competitive and things get done fast, and the Chinese state has policies to promote EV adoption, so there's a huge domestic market.
Note that the last point is different from subsidies to car manufacturers. Cities made it difficult to get license plates for ICE cars. The government encouraged the massive buildout of charging infrastructure. And it used consumer rebates, like California did.
aside from the huge domestic market (or potential in the future), china has built incredibly efficient infrastructure for manufacturing prototyping/production.
but it's also thanks to protectionism, and their strictly controlled (not freely traded) cheap currency.
if china had to play by the same rules as japan or germany it would not be quite as successful. but the west walked into this trap, hoping their win-win proposal would be satisfactory for all. now the west is too dependent on chinese production to enforce equal standing.
of course the US has its own unfair advantages, e.g. the global reserve currency and the massive post-WWII headstart.