Alf is by no means astonished that somone is promoting the idea that Maori prefer to buy stuff from Maori rather than from non-Maori. To sell more stuff, accordingly, a business needs more Maori salespeople.
It’s just an extension of the idea promoted by Hone Harawira, the Maori Party MP (and hothead) that his offspring should only marry Maori.
But Alf would take issue with the notion that non-Maori are similarly guided by ethnic considerations when they pop into a shop to buy something, and that they prefer to deal with people of their own “culture” (a nice way of saying “race”).