Clearly this is an overstatement of the current situation in that radio is only mandated at Reg, CERT and a few other CTAFs ...which are mainly those with RPT.
Not if the hidden agenda is the return of MBZ's......??
Do you honestly think that a mustering aircraft flying out of A station in the Upper Gascoyne would give a departure call?
There is good chance he would be below area frequency coverage and be on 126.7, if not on a company freq. and then in effect he is no radio..... See and avoid is the next option if you are in the weeds also!