That is interesting, because the chinese do care about in-groups
Investing in BYD is propping up the CCP and their dystopian authoritarian regime. Your phrasing of “imperial core” is meaningless. But the CCP is literally authoritarian in its political system.
Nothing wrong with any one investing in BYD or similar tech (vs any other investing). If anything, investing in non-“imperial core” companies seems to be a good thing to balance out unequal exchange and the global north and global south divide.