E34: The Clovis Peoples Pt. 2 - Were the First Americans Australian?

The Clovis People have long been accepted as the first humans to arrive in the Americas. Then spearheads were discovered in the Americas that pre-date the Clovis by 2500 years. Is it possible the first settlers in the Americas were actually Australians who reached the Chilean coast? Or Siberians who came down the Pacific coast in canoes?