They can say that, but legally they can't enforce it, they are bluffing...
In 2012, the NZ government made a decision that it would not link children’s vaccinations to either welfare payments or childcare access. Please see the press release: Immunisation decision “Important victory for human rights” (October 26, 2012) at this link http://www.noforcedvaccines.org/press-releases/ for details.
Thanks for that,