COULD be. Also might NOT be.
If I publish instructions on how to thread some steel pipe, and install threaded end caps onto that pipe, am I being a helpful plumber, or am I teaching people how to make a pipe bomb?
You're being very selective in quoting legislation.
Summary Offences Act 1981 No 113 (as at 24 August 2014), Public Act – New Zealand Legislation
(2)It is a defence in a prosecution under this section if the defendant proves that it was reasonable in all the circumstances to print or publish or make the description or depiction to which the prosecution relates.