There seems to be a bit of confusion here between import policy and legislation on knife ownership.
No knife is prohibited from being owned in NZ - you may own daggers, swords, butterfly knives, OTF's, knuckle dusters etc. but you may not import them without a permit.
There is no minimum or maximum length when carrying a knife, its all down to what the coppers refer to as reasonable excuse and his/her interpretation thereof. (the 89mm blade length is an import length)
You can find the police guidance policy here which details instructions to officers and also lists the various legislation which you can find on https://www.legislation.govt.nz/
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