You posed three questions.
Yes. There is more background to this but not for public discourse- at least by me anyway. Others may have the info from their sources.
Australian law. With a film crew on board I think the flight changes from PVT to CHRTR. Thus the standard flight deck access stuff applies.
Note the word of the word 'group'. Thus Jetstar, QLink, Jetconnect, etc. Mainline is down in gross airframes from previous highs. Not 100% sure of exact numbers but mainline is much smaller than it was a couple of years back.