If your husband is entitled to some other points, as listed here
https://www.immigration.govt.nz/opsmanual/#66763.htm, and can give the evidence to prove this, to make up the difference, it will be possible for INZ to continue processing his application for Residence under SMC. It's a good idea to be careful about timing on this. INZ will probably want to see proof for the other points without delay once they are notified that he no longer has the 30 points for out-of-Auckland employment, so he should be ready for that.
On another matter, his Work Visa will almost certainly allow him to work only for his present employer at the present location, so if that's the case, he mustn't stop that work until he has a definite other job offer, and has arranged with INZ, once they have checked out the new job and verified that it meets his visa conditions, for either a Variation of Conditions, or a different work visa (depending on the details of the situation), to take over from the present visa. See here
https://www.immigration.govt.nz/new-...c-are-changing and here
https://www.immigration.govt.nz/new-...c-are-changing - one of those will probably apply. It would be illegal to start at a new job on the old visa, or to be still at the old job once a new visa has been issued, which is why INZ needs all the details of the notice period that has to be worked, and the wished-for start date of the new job, so as to co-ordinate things to keep him legal.