BYD still doesn't want to sell in Europe in bigger volume.
Because they want to milk Europe for higher margins. Even with tariffs, they can afford to do so. The competition in China is much fiercer, so margins there are lower. This isn't just a BYD thing, it's across all Chinese brands. Which is why they have made very limited headway in Europe and they seem to be fine with that for now.
The problem here is really with the established European brands. They don't give much competition, which allows these Chinese companies to price their cars at absurd premiums compared to their home market. Corporations are not about welfare. They will sell at whatever price they feel they can get away with.