Never heard of HarmonyOS ? And the problem is not Android but the Play Store access.Never happened, still hasn't happened as Huawei is promising they'll support the OS updates even after the licensing extension expires this month(?) IIRC.
As for Xiaomi you do know they use their own UI, skin & apps much like Samsung, LG et al, completely based on Android?
And even if Xiaomi is not yet kicked out, it may happen.