Earlier quoted context omitted.
Here's an article that gets into the differences between the Vedic hymns and the later material that grew around them (in section 2): https://lrc.la.utexas.edu/eieol/vedol In particular: ”Over time a body of dependent and scholastic material grew up around the poems, known loosely as 'the Veda'. Perhaps around 1000 BC (all dating in prehistoric India is only approximate), editors gathered the ancient poems together a…
Are you claiming that ‘linguistic analysis’ by non Indians/Hindus at the university of Texas supersedes knowledge that was orally transmitted for aeons before linguistics as a term was even coined?
Historical linguistics is an evidence-based field of study that many Indian scholars also actively participate in, wherein they also analyze non Indian languages.