CASA granted Dick an exemption. With an exemption you can fly above F280 around the J-curve and off the coast from SW WA around to NE NT. Outside those areas you still have to operate F280 or lower, exempt or not.
CASA EX113/13 - Exemption - temporary relief from requirement to carry serviceable ADS-B transmitting equipment when operating in defined exempted airspace
There are very few aircraft regularly flying that aren't compliant and F280 is far from being crowded.
Would "operational expediency" mean "for separation"?