From 28 June 2021, TVNZ OnDemand shows won’t be available through Freeview On Demand anymore - you can only stream them through TVNZ OnDemand.
Because the SNT7070HbbTV uses Freeview On Demand to access video on demand content you will not be able to access TVNZ content on the SNT7070HbbTV
If you have either the SmartVU SV11 or SmartVU SV10 You will be able to download the Android TV version of the TVNZ OnDemand application and continue to stream TVNZ On Demand content on your device.