I feel like "only NZ could have done this, since they are an island" is a cop-out.
Any nation could adopt other pillars of our system also, such as free testing, free healthcare, free vaccinations. Or Contact tracing, quarantine of infected people. Clear scientific communication by those in charge.
It's not magic, it has been well documented what to do in pandemic situations for 20 years. Only the specific tools (the test, the vaccine itself) are specific to Covid-19.
The only way to eliminate it to a basic endemic state, is via the immune system.
And the fact that vaccines just reduce the symptoms and don't stop it's spread....means it's never going away.
Eliminate revolves around the strategy of stopping viral spread in a given population until there are no new cases. That population in this case is NZ, not the world.
For more info on "Keep it out, Prepare for it, Stamp it out," read https://www.health.govt.nz/our-work/diseases-and-conditions/...
Will never happen happen except temporarily. That's just fundamental epidemiology.
It's a pity that more nations aren't doing so.
This is because they are an island, and they eliminated Covid once and are aiming to do so again.