That is my understanding of these regulations, too.
INZ seem to be very understanding that partnerships come and go. If there was somebody who had a visa like yours, and had since separated from their partner, but HADN'T qualified for PR, there's another regulation that says they're entitled to extend their travel conditions or extend their residence. And you're a whole step better qualified than that.
RV1.20.1 Non-principal applicants who are partners
The partner of the principal applicant is eligible to be considered in their own right for variation of travel conditions or a new residence class visa if the following events occur:
the partner and the principal applicant become divorced or separated; or
the partner is granted a non-molestation or protection order against the principal applicant; or
the principal applicant is convicted of an offence against the partner or a dependent child;
the principal applicant dies; or
the principal applicant has obtained New Zealand citizenship.
http://www.immigration.govt.nz/opsmanual/45650.htm