As I undertand, this ship was out of New Zealand and visting Australia.
Here are the covid requirements to sail there as of Nov 2. So my understanding is few unvaccinated (if any) passengers.
CruiseHealth™ FAQ: Sailings from Australia & New Zealand
Updated November 2, 2022
What's on this page: COVID-19 Vaccination Requirements | COVID-19 Acknowledgement | COVID-19 Testing Requirements | Before You Sail | Embarkation | Onboard Experience | Health & Safety | Shore Visits & Excursions | After You Sail
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Current Health Protocols for Cruises Visiting Australia, New Zealand & South Pacific Countries
Vaccinations
Guests must have received their final dose of an authorized COVID-19 vaccine at least 14 days before the beginning of the cruise and provide acceptable proof at terminal check-in.
Boosters are highly recommended for those eligible at least seven days before cruising.
Testing
At terminal check-in guests must attest to a negative viral COVID-19 test (PCR or rapid antigen) taken before embarkation.