Tor bapere Miya hoi kela.... If a person lived in Assam and his voter identity is belongs to Assam it means he is Assamese, No matter what language he choose to speak 🗣️. In Tamil Nadu there are several kinds of people, some people says Tullu language, some people says Tamil, some people says telagu language.. So it's their choice in which language he is comfortable.. This is india with diversity... You might not be went to school that's why you comment that unnecessary staff.... So go school study geography book. Know more about India and Assam as well.