To me that reads like police seeking to avoid any independent, objective analysis of their work or of crime in New Zealand and, instead, using coercion to massage any such study to suit their own ends.
Police are adept at controlling information and have become increasingly image-conscious and seem determined not to be seen in a bad light, whether that be a true reflection or not.
Those who attended Dr Gilbert's talk in Wanganui in September may not be surprised by any of this - particularly if they recall the "Paul Holmes was a gang member" element.
Dr Gilbert produced police pronouncements of recent years that gangs were responsible for the vast majority of organised crime in New Zealand and for the bulk of the illegal drugs trade. That did not square with his experience of the gangs and so he meticulously unpicked the figures and concluded that gangs were responsible for only about 3 per cent of organised crime in New Zealand.
It depends how you define a gang member. The police would deem anyone with a family link with a gang member as also a gang member.
Paul Holmes' daughter Millie Elder was the girlfriend of Head Hunters member Connor Morris - hence the statistics had poor old Mr Holmes in there, too.