Lovely, reading the article its full of gems like
“Of particular concern is the large Polynesian subculture whose educational achievements mean they will contribute very poorly in this regard,” Dr Clydesdale says.

“And because of high fertility and current immigration levels, New Zealand will have a significant population that can contribute little to economic growth.”

Lovely, lets just generalise a huge disparate group of people based solely on the geographic area they are from. I hope he puts out a paper on the land stealing tendencies of European immigrants next.