As they live in NZ and get paid in a NZ market how is this relevant? Ask what a king air pilot in NZ gets paid. It will certainly be less than a J* f/o.
I would suggest they took the job because it paid more than their turboprop job and gave them opportunity they wouldn't have had while waiting for Uncle Koru to hire, if that was their thing.
It may seem foreign to Australian pilots that NZ GA pay is very poor and regional flying not great pay either, so I understand ignorant posts like j3piper. So what may seem like badly paid jet jobs to some is not to others.
With NZ having different labour laws, much less militantly unionised work forces and the fact that being owned by Aussie companies can get away with paying kiwis less for the same job across the Tasman(due to exchange rates and market conditions), jobs like J*, JC and VANZ are good options.
And ask yourself honestly if you would be happy with kiwi pilots undermining you by coming to Aussie doing your flying while you try to get a better eba and to benefit at your expense as well?