From my reading of the alliance rules - you got away with that one but shouldn't have. NZ status pax purchasing a DJ fare do not get any additional baggage entitlement beyond what the fare offers (and vice versa - DJ status pax do not get additional baggage allowances on a NZ fare).
That is true to trans-Tasman flights. But the FFP partnership covers more than the trans-Tasman alliance routes.
From the DJ site, Velocity Gold entitled to the following. So outside the Tasman, Velocity Gold gets Airpoints Gold allowance. Reciprocally, Airpoints Gold gets Velocity Gold allowance, ie 32kg on the Saver fare within Australia. That's my understanding anyway.
[TABLE="width: 100%, align: center"]
[TR]
[TD]Air New Zealand (Tasman)
[/TD]
[TD]Priority check-in, Priority baggage, Priority boarding
[/TD]
[/TR]
[TR]
[TD]Air New Zealand (Non-Tasman – including NZ domestic and international*)
[/TD]
[TD]Priority check-in, Priority baggage, Additional checked baggage of 1 piece up to 23kg
[/TD]
[/TR]
[TR]
[TD]*Excluding Pacific Islands
[/TD]
[TD][/TD]
[/TR]
[/TABLE]