[causi]

Yes, Maori arrived in NZ. They were the first people to do so.

So you don't count as indigenous if you weren't the first? That's bad news for all the Clovis-descended peoples we now call Native Americans, since they were the second major wave of human migration. That is of course ridiculous, because time of inhabitation is a significant part of being indigenous. If it were discovered another group had beaten the Maori to New Zealand, would that suddenly make them not indigenous in your eyes?

[cgrealy]

Merriam Webster - Indigenous: of or relating to the earliest known inhabitants of a place and especially of a place that was colonized by a now-dominant group

Wikipedia - Indigenous peoples are culturally distinct ethnic groups whose members are directly descended from the earliest known inhabitants of a particular geographic region and, to some extent, maintain the language and culture of those original peoples

By what measure are Maori not indigenous to NZ? If another group arrived first, they certainly didn't stay, and even by your own measure of "time of inhabitation", Maori have been here the longest (at least 350 years before Europeans).