An interesting side article from the main one you posted:
“A genetic study is threatening to transform theories about who the first people to inhabit the Amazon really were.
Scientists have found three native tribes living in modern-day Brazil are in fact more closely related to Aborigines in Australia than they are to any other living population.
It suggest that the ancestors of Aborigines from Australasia may have migrated to South America thousands of years ago.
The findings also contradict the common belief that all native peoples in North and South America are descended from one group, known as the First Americans, who migrated across a land bridge over the Bering Strait around 15,000 years ago.
It is not known how the Aborigine ancestors made their way to Brazil, but it is possible they may have come by see or crossed ice to get there”
Terra Del Fuego or preset day nation of Chile may have been where travelers from Australia landed when blown off course.
www.wikipedia.org has a good section on Fuegians and their possible origins.
The easiest possibility is that the aboriginals split into two groups, with one going over the Bering Strait and the other going south in Indonesia.