Just like the Norwegian blue, jurisdiction "don't enter into it."
The state of Queensland is not controlling the airspace in any way or aircraft access. It is just saying that if you are in an aircraft (with some caveats) in an area geographic area (airspace), you must wear a mask.
I had to wear the mask during my last flight review. It lasted until about the crosswind turn before I had to take it off to stop fogging up my glasses.
FWIW masks are expressly forbidden by Airbus in the cockpit as they are a safety hazard for that very reason, as well as other HF aspects of communication cues. Back locally, if you care to read the relevant Directions, both NSW and QLD address this issue stating that pilots don't need to wear masks in the cockpit.... but don't let that stop the hypotheticals.
There are plenty of faults and gaping holes in rushed legislation in these COVID times, but that's not one of them....
And as for the off shore limits, to be fair, even CASA struggle with that one....