JackD
Sorry, ATC is removed from the CSOL. See
https://www.border.gov.au/Trav/Work/...ed-occupations.
Yes, line ATCs always feel that there should be more bodies, but obviously management strikes the balance (arguably getting it right or otherwise) between the cost of staffing to slightly over 100% and keeping the ship running with a bit of resourcing tension to avoid staffing inefficiencies creeping in.
There's a long pipeline of citizen applicants to feed future demand. Non citizens with ATC quals are generally only recruited when there is a critical shortage that requires people to be on board faster than the normal ab initio training timeframes.