Looks like this is quite old...they will probably find even more introgression. Something like 80% of Australian languages are from Indian-derived language families and developed from around the time of the Dingo introduction (only 4000 years ago), so there basically had to be a substantial amount of gene flow as well. Only a minority of the aboriginal languages come from an earlier substrate. It would be surprising…
I'm assuming you're referring to the Pama-Nyungan family, which predates the dingo by nearly 2000 years?
I can't find any documentation of the Indian language families connection, do you have any?
This reminds me of the Tamil nationalists who, like some Serbs, like to claim that their language is the ur-language.