Interesting to see overseas coverage of this. There seems to be a few errors or misunderstandings. One key one repeated in the article:
There are currently 978,246 Maori in New Zealand, constituting around 19 percent of the country’s population of 5.3 million. They are represented by Te Pati Maori, or the Maori Party, which currently holds six of the 123 seats in Parliament.
This implies the Māori Party is the only representation, and implies 6/123 MPs represent 19% of the country. In reality, there is nothing special about The Māori Party, and Māori people vote for who they want to represent them like anyone else (yes there are Māori electorates but that's different and Māori can choose if they want to be on that system).
At multiple points they present the Māori Party as if they are the designated representation for Māori, which isn't true.