BYD is extremelly efficient, but BYD is also beneficiary of an extensive state directed industrial policy. And let's not forget that China keeps their currency intentionally devalued against the west, while the US now have the problem of an over-valued currency.

Just to add some perspective. It is still cheaper than anything Detroit makes, but 10.000 USD is a bit misleading if you ignore currency policies, subsides, incentives and regulatory differentials.