I know Steve, and you're right. I was putting forward a possible viewpoint of these daft objectors. They'd probably say that if there were any non-Maoris in the NZ team, the haka should not be allowed to be performed, as the non-Maoris would be 'appropriating their culture'
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'Cultural appropriation' could be seen almost anywhere. When I visit in West Africa, I wear a 'pagne' (wrap-around long cotton skirt) borrowed from one of my sisters-in-law. I do this to protect my legs from the sun and to be decent (legs aren't on show there!) But the PC brigade could say I'm out of order wearing African clothes while not being African.
They're just casting around for anything to get het up about, as pfr says.
I think this obsessive fad will pass in time.