Basically there's genetic (Y chromosome) and linguistic evidence suggesting an infusion of Indian immigration (~5000 years ago so maybe a distinct event from this). One plausible explanation is that some Dravidian seafarers crash-landed in Australia and got absorbed by the local population. From their perspective it probably would have felt like sinking into savagery.
The sentiment is lifted directly from the linked post.
It's hard to argue with given the subcontinent had agricultural, seafaring populations while Australian populations never made it past Paleolithic hunter-gathering.
Basically there's genetic (Y chromosome) and linguistic evidence suggesting an infusion of Indian immigration (~5000 years ago so maybe a distinct event from this). One plausible explanation is that some Dravidian seafarers crash-landed in Australia and got absorbed by the local population. From their perspective it probably would have felt like sinking into savagery.