So, counterpoint: genocide aim to destroy the culture of a group, either by killing the women and children alongside to fighters during a conquest/repression, or by forcefully moving them to make them mix with a new dominant culture (Crimean Tatars are an example). This almost always end in streamlining the language and destroying language diversity, often reducing it to a single one for all the survivors/moved. While not even close to the SEA level, India is one of the subcontinent with the most different spoken languages, which would indicate that it might not have been that bad. At least, not genocide-bad.