This is a great pity.
I would have thought that a civilised and sensible country like N.Z. ( my birth place before anyone starts slagging me off) would realise that this use of the CVR will set back the cause of aviation safety. (Although I am glad that the new act has come into force.)
Soon it will be standard practice to erase the CVR on shutting down especially if there has been an incident or accident, and where will that get us! certainly not any closer to learning and hence avoiding our genuine mistakes.
To Err is Human!