At the time the Labour party promised they would reverse this, and re-establish the authority. But now they've changed their minds and won't bother. Why not? Because National might just disestablish it again.
This is Labour in a nutshell: pure chickenshittery. Refusing to do anything that National might object to effectively surrenders in advance to the far-right. So what's the point in them holding power if they're not going to actually do anything with it? Its obviously great for the pyramid-climbing Labour apparatchiks who will get huge Ministerial salaries and free housing and transport for doing nothing. But what's in it for the rest of us? Absolutely nothing.
A party which pre-emptively commits to not changing anything, even when it is a blatant injustice and violation of our constitutional foundations is not worth your vote. It is that simple. If you want change, vote for a party which will actually deliver it. In this case, that means voting Green or Te Pāti Māori.