Oh maybe you mean this.
Players are signed from the perspective of NZF/Feds to a club, not a team. They may play for (any eligible, I.e age) teams in that club so long as the individual player does not breach rules about playing down in other divisions.
Players can only move clubs prior to end of June; they have to remain with that club till end of the national/championship phase.
These are amateur competitions; there is no concept of.going "on loan". You're signed on to one club.