He isn't - he's the EGM ATC.
In any case as you are well aware, its not an Airservices decision what airspace class should be where. They are simply the ATSP/ANSP.
CASA is the airspace regulator, so it is their decision. If they don't consider Class E is warranted/justified down to 700 AGL or lowered anywhere else below what it currently is, its their decision.
Airservices has to abide with CASA's decisions, and put in TWRs, RFF and staffing accordingly.
Perhaps you should be talking to their Office of Airspace Regulation -