Thanks for those links. I'm aware of those ideas. They were interesting at first but haven't been corroborated in other research.
The first link is about "“Population Y”. This relationship with Australoids has been found before. Because it's been found doesn't neccesarily mean Aborigines sailed to America. Australoids were widespread in the Pleistocene and occupied territory into present day China. Probably resulted in gene flow between the Asian groups.
Late Pleistocene exploration and settlement of the Americas by modern humans "The Lagoa Santa individuals and some contemporary Amazonian tribes share a subtle genetic connection with Indigenous New Guineans, Australians, and Andaman Islanders (6, 8, 12, 20). This signal appears to be derived from an extinct ancient ancestor of both groups (Population Y), but does not represent a migration of a group of Australasian ancestors to the Americas."
The second link is about Walter Neves work using skull morphology. This was a popular method in the 19th century. Neves at first claimed Lucia had African or Australoid morphology. When it was pointed out that Africans and Australoids are the least related modern humans, he switched to just Australoid. The bottom line of his work is that the genetic evidence shows that you can't make the connection he's trying to make. The long time frames allow for wide physical variation between ancient ancestors and modern descendents.