The Greens haven't said a word on Ports of Auckland either. No press releases, and nothing on Frogblog. While they don't have the history of Labour in this area, they have a progressive industrial relations policy (arguably more progressive than Labour's). Which makes their silence just as odd.
Again, I expect parties to stand up for their purported values and those of their supporters. If they don't, then their basic bargain of offering representation in exchange for votes is simply a fraud.