Air New Zealand Air Points - Codeshare on LAX-PPT with TN

I tried to book on a NZ ticket a Europe-LAX-PPT-AKL and return flight for next summer (mid July). The travel office is not able to get the LAX-PPT leg confrimed (on TN), because -as they tell me - NZ will end the codeshare agreement with Tn next year. Is this true? If yes, will NZ fly again directly LAX-PPT?

Because of the financial state of TN, they probably only will allow you to book this sector so far out. I don't see NZ returning to LAX-PPT unless TN ceases services which of course could be possible.