I just checked our booking for a NZ/ Aus cruise in December and there appears to be a new format and they no longer require the Antigen test to be monitored by Medical personnel which is a change from a couple of days ago. Below has been copied from my booking on HAL site.
Australia Protocols
Vaccination
All guests 12 years of age and older must be fully vaccinated.
Children under 12 years of age do not need to be vaccinated.
Testing
All guests ages 5 and older are required to take a COVID-19 Test.
PCR COVID-19 test must be taken within 72 hours before embarkation.
Medically observed or self-administered COVID-19 antigen home test within 24 hours before embarkation.