Peopling of India: circular inference?

http://www.ncbi.nlm.nih.gov:80/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14525929&dopt=Abstract

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Molecular study on peopling of India
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Relevant to issue of the origin of IE speakers in India. But some of
the inferences in the paper appear to derive from circular reasoning.