Have a look at this link:
Civil Aviation Safety Authority - Pilot Log Books
Takes you to a page titled Pilot Log Books—General Guidance and crediting of flight time.
Specifically, there is a section titled Flight Simulator or Synthetic Trainer Time which says (my bolding):
Practice in an approved simulator or trainer may be recorded in the section provided at the rear of the log book. The instrument flight element of the simulator time may be transferred to the 'Ground' column of the Instrument Flight section of the flight record.
If a Flight Simulator or Synthetic Trainer Practice section is not available in the log book, the details may be entered chronologically in the flight record, and the Instrument flight element transferred to a suitably titled column.
In older log books, the 'Ground Training' or 'Simulator' column of the Instrument section of the flight record may be used for 'Ground' entries.
There’s another section titled Grand Total Flying Hours which says:
Grand Total Flying Hours is calculated by adding all numbered columns in the flight record, plus ICUS, and recording the total at the bottom of the page.
Therefore my take is that simulator time does not contribute to grand total flying hours.
Of note, the RAAF has recently joined the 21st century and changed its flying test report form to more clearly detail experience gained in simulators.