> Maori were never actually excluded from university study, by the way
Māori schools (which the vast majority of Māori attended) were forbidden by the education department from teaching the subjects that lead to matriculation. So yes, they were forbidden from going to university.
> Sir Apirana Ngata. He studied at a university in NZ in the 1890s,
That was before the rules were changed. It was because of people like Ngata and Buck that the system was changed. The racists that ran the government were horrified that the natives were doing better than the colonialists. They "fixed" it.
> Discrimination in favour of Maori students largely has benefited the children of Maori professionals
It has helped establish traditions of tertiary study in Māori families, starting in the 1970s
There are plenty of working class Māori (I know a few) that used the system to get access. (The quota for Māori students in the University of Auckland's law school was not filled in the 1990s. Many more applied for it, but if their marks were sufficient to get in without using the quota they were not counted. If it were not for the quota many would not have even applied)
Talking of lies: "white people with a tiny percentage of Maori ancestry who take advantage of this" that is a lie.
The quotas are not based on ethnicity solely. To qualify you had to whakapapa (whāngi children probably qualified even if they did not whakapapa, I do not know), but you also had to be culturally Māori.
Lies and bigotry are not extinct in Aotearoa, but they are in retreat. The baby boomers are very disorientated, but the millennials are loving it.
Better for everybody