Doesn't seem quite right to me as National did end up 7.5% end of Labour. I'm not sure if the Greens are sort of an assumed Labour Party coalition partner as Labour and the Greens combined would have only been about 1% behind National.
The default in NZ is to count Labour and the Greens together.
Ah, well that's different.
Remember MMP is a proportional system, while the Nationals had the most votes, they did not obtain a majority alone. Labour-NZF-Greens have a majority and have now agreed to form a government.