You're right that the paragraph you've quoted could be read that way, and is badly worded, to the point where, without any additional context, it could be inter

You're right that the paragraph you've quoted could be read that way, and is badly worded, to the point where, without any additional context, it could be interpreted to be saying that the genocide is a myth. But there is additional context, and the rest of the article makes no attempt to deny the genocide and enslavement of the Moriori. The Moriori weren't pre-Maori people, and they weren't completely obliterated (by the 900 Maori that attacked them) - that's the myth.