RSBM, BBM.
NZ Population Ethnicity from Wiki:
In the 2013 census, 74.0% of New Zealand residents identified ethnically as European, and 14.9% as Māori. Other major ethnic groups include
Asian(11.8%) and Pacific peoples (7.4%), two-thirds of whom live in the
Auckland Region.
[3][n 3] The population has become more diverse in recent decades: in 1961, the census reported that the population of New Zealand was 92% European and 7% Māori, with Asian and Pacific minorities sharing the remaining 1%.
[253]
Source for above:
New Zealand - Wikipedia
NZ Prison Facts - Ethnicity of Prisoners - 2018: (from pie chart)
Maori (NZ Indigenous): 50%
European: 31.3%
Pacific: 11.6%
Other (including Asian): 4.4%
Unknown: 2.7%
Source for above:
Corrections Department NZ - Prison facts and statistics - March 2018
So it looks like he actually would have a good amount of whites to pal around with in prison, though it might depend on how he is classified as to how and who he would be exposed to when it comes to other inmates. I'm not sure what prison culture is like in NZ, if there are ethnic gangs etc that stick together no matter what. My guess is they desperately want to keep him away from the other prisoners especially whites for fear that he will try to radicalize them. IMO.