Yep most kiwis I know that follow soccer follow English soccer,(adult grandson and mates all follow team, and he doesn't follow rugby either) same as most kiwis I have met that follow league follow Aussie teams in NRL, but I hardly know many that follow the sport. But for intance, I go to Kaponga to watch 2nd div rugby here in Taranaki a lot, a town of 312 people, has a rugby club and soccer club. I know in Taranaki and most places in NZ there would be a lot more soccer clubs than league clubs, there seems to be quite a big number fo games from at secondary schools I see going on when I watching rugby, but never seen a league game. I know there must be league teams here in Taranki, but know there are more soccer clubs etc. Hell I got 2 3 Aussies in family here in NZ, and none of them are into league, one is a rugby man and pasionate AFL man, the others just watch a bit of rugby and a bit of AFL one and soccer other one.
Not saying league isn't big in Oceania or anything, just never seen evidence outside of Australia as a rule. Same as I never followed AFL, but would definitely think that is biggest game in Australia by quite some amount.
But even on Breakdown etc, you will hear panel talk of their NRL teams etc, so you right they watch a bit of that, but think you find that quite a few NRL players will watch Wallabies etc too, doesn't mean they swapping an any case, just most follow a lot of sports.