Plenty of Indians/Hindus conduct the same sort of linguistic analysis, beginning with a guy called Panini who lived around 800 BC. In any case, the nuance and depth of the arguments in the University of Texas article far supercedes the a priori (and apparently religiously nationalist) statements you are making here.

Historical linguistics is an evidence-based field of study that many Indian scholars also actively participate in, wherein they also analyze non Indian languages.