The source given is not traceable and is therefore probably not particularly valid. I'm with Max-baby. No one knows how the Moriori counted from one to ten. Or if they did count from one to ten at all. Or did anything else for that matter, either linguistically or culturally. They've been effectively extinct since about 1750. Or so. The Maori needed the protein. Worse, they coveted the land.

Say, Max, now there's a perfect solution to the ongoing saga of the Waitangi Tribunal!