The rule of not competing in CAPO ( or other non-tested powerlifting feds ) is a condition of Australian Sports Commission sanction, and ASADA govt sponsored drug testing.
Don't blame an individual.
NZ has a similar rule
"2. No member of the Federation shall be permitted without the written permission of the NEC or a member's Affiliated Organisation to compete against a non-member or to perform at displays, including
powerlifting, held and organised by bodies not affiliated to the Federation. No official of the Federation shall be permitted to adjudicate at clubs or organisations not affiliated to the Federation."