2 points.
Many of the South African pilots already have Australian residency with their familys esconsed safely in Australia while they commute to and from. They will have no problems. I don't know about the others and 457's.
The other is the reference to using the pilot shortage as a bargaining tool "so many expat aussies, awaiting an improvement in t&cs can come home"
Yoohoo, that one got me going. I am sure that is just what the J* pilots should be holding out for.