How much does time bury?

A. Recently, Ruhlen has documented close affinities between an obscure language of Nepal, Kusunda, generally classified as related to Chinese (Sino-Tibetan) and the language family of Papua New Guinea, called Indo-Pacific. Here are some common features between Kusunda and one of the languages of this group, Juwoi.

Evidence for the relationship between Kusunda and Indo-Pacific languages:

B. This relationship is crucial because humans are known to have traveled from southern Asia to New Guinea at least 50,000 years ago, with recent evidence suggesting as long as 75,000 years ago. Thus, these words may represent the oldest documentable historical relationship between words and show that many linguists’ claim that no relationship between languages can be documented beyond 6,000 or so years is untenable.