Section 40 mentions about a standard being gazetted in the future with industry consultation. Plus the police website right currently states 'Although no standards have been Gazetted yet, the European Telecommunications Standards Institute (ETSI) standards and specifications, specific to the type of service to be intercepted, are the standards we are currently working to.'. So, right now everything implies that whilst ETSI is preferred it is not currently the standard.
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https://gazette.govt.nz/
assets/pdf-cache/2017/final/ .2017-08-17_Gazette_83.pdf ��
Pages 119 and 120 are of note. There has been a Gazette about this.