Comment by runsWphotons

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 if there doesn't also emerge evidence of substantial conflicts around this time.