Well, I see no public evidence of this happening.
I've looked at every job site & listing from US regionals, TP freight feeders and large Part 135 operators over several weeks (some that should be absolutely desperate for pilots based on what they offer an applicant). Not one is admitting to using this visa to get Aussies in here nor does my Aussie contact whose finger is on the pulse of stuff Down There find any evidence.
I don't see a reason why a US carrier would NOT admit it if they were doing it...beyond ruffling a few feathers. But then when did any airline worry about ruffling a few feathers.
Highly suspicious of this based on the lack of evidence so far.