Seems that there is not much support in the earlier occupation theory put forth. It is referred to as "Alternative Archaeology". Here is the link.
ht$p://www.nzarchaeology.org/alternative.htm
New Zealand is blamed for Maori enslavement of ancient people By Ray Lilley, AP, in Wellington Saturday, 16 June 2001 Share Print Email Text Size Normal Large Extra Large When warlike Maori invaded the peace-loving Moriori people more than 150 years ago, killing scores and enslaving hundreds, the government in Wellington ignored the atrocities, a tribunal ruled yesterday. So the present government should compensate the victims' descendants, the Waitangi Tribunal report concluded. When warlike Maori invaded the peace-loving Moriori people more than 150 years ago, killing scores and enslaving hundreds, the government in Wellington ignored the atrocities, a tribunal ruled yesterday. So the present government should compensate the victims' descendants, the Waitangi Tribunal report concluded. By ignoring the plight of the Moriori people of the Chatham Islands, 800 kilometers (500 miles) east of New Zealand's capital, Wellington, the government was partly to blame for the loss of life, says the report. "The continued survival of the Moriori as a people is now at risk as a result of the loss of people over this time," the report said. "We recommend compensation with negotiations to that end." The Waitangi Tribunal, an independent body which hears land confiscation and other grievances from Maori tribes, was set up by the government to propose solutions to long-standing tribal claims over government breaches of the Treaty of Waitangi, New Zealand's founding document. The last pure-blood Moriori died early last century, after their tribal life and culture was destroyed. Slavery, widely practiced by the indigenous Maori tribes, was ended by missionaries. The Moriori, who created a non-violent tribal culture, were conquered by warlike mainland tribes in 1835. Mixed-blood descendants still live on the islands. The tribunal report said after they were conquered, Moriori were housed inadequately, forced into extreme labour, brutalised and, for a time, killed by Maori. "In 1862, Moriori elders made a plea to the government for relief, listing the names of 226 killed and 1,366 who, they wrote, had died of 'despair'," said the report. "The government did not respond." The Moriori claimed the government was in breach of its treaty obligations by failing to take reasonable steps to secure their release from slavery. The tribunal said the government knew of their plight, and failed to intervene to help them. The tribunal also called for return of the Chathams 18,000 hectare (45,000-acre) lagoon to Moriori ownership, and the allocation of marine reserves and fishing resources. Under New Zealand law, the tribunal can only make recommendations for resolving grievances to the government, which then negotiates with the tribe. The government of Prime Minister Helen Clark declined comment on the report.