You don't think that overestimating a program by around double isn't a "stuff up"? Give it another name if you don't like that term but it won't change things. It was treasury's modelling alone that arrived at this figure which was announced in the PM's press release on March 30th. Now the government is saying that it was errors during applying by companies that has resulted in the discrepancy.
"In a statement, Treasury and the ATO said the mistake came from businesses reporting how much financial assistance they expected to receive, instead of how many employees they thought would be eligible. "For example, over 500 businesses with '1' eligible employee reported a figure of '1,500' (which is the amount of JobKeeper payment they would expect to receive for each fortnight for that employee)," the departments said." (https://treasury.gov.au/media-release/jobkeeper-update)
This is utter rubbish as the $130b estimate came out before even one employer had applied and the statement misrepresents the situation.
"Based on the original estimates, Treasury believed the program would subsidise the wages of 6.5 million workers." This was a treasury estimate, employer application figures had absolutely nothing to do with that estimate.
Whatever it's called, it looks like a stuff up.
However, this is getting off the track. The OP raised the issue of how many aviation workers missed out by Job Keeper despite being on the payroll of companies in Australia. Let's stick to that. For example, how did Australian based Air New Zealand workers get on given the NZ gov't owns 52% - did any of those get stood down and, if so, were they disqualified from Job Keeper because of foreign involvement?