You might want to contact CASA and ask them.
After albeit cursory research, I cannot find any draft Part 43 regulations. If there are not any near-final draft Part 43 regulations now, there will be no Part 43 during your or my lifetime and your employer's position is sensible.
Despite the Orwellian description "completed" and "resolved", the regulatory 'reform' program has actually been "abandoned". The mess generated by the current dog's breakfast will keep CASA running in (very expensive) circles for a long time yet.