The economic and legal definition of dumping is as I stated it. Subsidies don't affect this, unless the subsidies are only for cars bound for the export market. This is how the WTO operates and its member states. For example, in the UK, here's what the legislation says:
"(2)For the purposes of this Act imported goods shall be regarded as having been dumped—
(a)if the export price from the country of origin is less than the fair market price there (whether the country of exportation is the same or a different country); or
(b)if the export price from the country of exportation (if a different country) is less than the fair market price there"
https://www.legislation.gov.uk...
No reference to subsidies. All that matters is the export price being less than the fair market price in the country of origin.
Calling what the Chinese are doing "dumping" is just a massive, massive cope. It inverts the economic reality, which is that Chinese OEMs are looking to compensate from insanely fierce price competition at home by exporting cars at a higher price, so they can make back some margin.