were exactly chinese  back then in the ethnic sense; it just means some of the nomadic tribes were included in the Manchu empire which conquered china. I doubt there was any measurable cultural/ethnic intercourse between those Qing Ainu and main stream chinese(sinocised manchus included). Genes(though identifiable visually) stats means much less than cultural memory(oral or written). 2 interesting examples I know:

-- A colleague told me his wife was often mistaken as a pino domestic but I've no doubt she's chinese.

--A darker skin woman I know.She was adopted but I suspect her biological father was either a pino or a south.asian. She once said she prefers S asian immigrants over ML ones. An unhappy woman whose BF was once snatched(in local hk colloquial 撬牆腳) by another (likely ML) woman. A major tremor in her life. I suspect many anti-ML female activists went through similar relationship experience.

Becos the australoids were migrating far away from their paleo 'origin', sure one would expect them to 'diversify'.

The classic australoids are still the dravidians and the aussie natives