Munda speaking tribals have 20-30% South East asian ancestry which entered India via the Odisha coast around 2000-1500BCE. So they indeed are not adivasi ('first settlers') Keep up with the genetic studies.
Vanvasi may or may not be apt, but adivasi is certainly not apt. Munda tribals literally speak a language from the SE Asian language family, and have 20-30% Laotian ancestry (or similar SE Asian) to match the language.
Austro-Asiatic language family is spoken by people in Vietnam, Thailand, Cambodia, Malaysia, Laos, Myanmar & India. en.wikipedia.org
The mainstream view accepts the 'Munda Maritime Hypothesis' - That a small group of proto Munda speakers arrived from SE Asia to the Odisha coast via sea. core.ac.uk
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