well, i'm skeptical.
but, supposing this is true, do they think they can keep it out of the country forever? or are they going to try to bring in forced vaccinations on yearly mutations?
new zealand has a useful geography for fighting pathogens, but it's ultimately a fool's errand to try to stamp out a virus with quarantine. they're just prolonging the inevitable.
https://www.citynews1130.com/2020/06/07/asia-today-new-zealand-succeeds-in-eradicating-coronavirus/