[Rookie Cookie]

Actually according to the study the Andamanese are close cousins of the Ancestral Southern Indians i.e they have a common ancestors. However Andamanes are NOT actually ASIs. They are used as proxies for the absence of pure Ancestral Southern Indians in today's mainland India.

[hellbender]

I suspect the situation is more complex. The Andamanese simply do not look much like south Indians. The latter lack peppercorn hair, steatopygia, and other Andamanese traits. There is also another “primitive” indigenous population to be considered: the Veddoids, who resemble Aussie aborigines more than Andamanese.