I see that is all they have on their web site, but have you asked?
Google threw up the "Rangitikei District Council - Hunterville Community Committee Meeting
Minutes – Monday 30 November 2009"
These mention the Hunterville (Rangitira) Cemetery, and seem to suggest some local management now. So perhaps it is no longer an in-use cemetery. That doesn't mean the council don't have the records. But if they don't, they should be able to give you a contact for the Community Committee.