It sounds like they are against the loss of playing space.
From what I've read, Welnix (I think) where essentially saying all of the Petone Rec would become playing and training surfaces for the Nix, with the main pitch possibly used by Rugby or League too.
I know we've talked about it in here but I don't think Welnix said anything about whether the training/extra fields could be used by other folks whenever or if they would be closed to the public.
So I think it's the loss of these fields that have Petone Rugby annoyed.
Yes they get a fantastic new stadium for their main matches but they lose the current four(ish) fields, or the two you see in the Stadium Illustration after construction, to all their other teams if they are to be used as Nix training facilities full time.
Like Hard News said, this probably should've been dealt with a long time ago.