It's not necessarily tautological because of how fluid the language/dialect distinction itself is, and often related to politics. The treatment of Latgalian as

It's not necessarily tautological because of how fluid the language/dialect distinction itself is, and often related to politics. The treatment of Latgalian as a Latvian dialect is certainly at least somewhat political, there's a case to be made for it being a different language. But for a counter-example, take the Scandinavian languages. They're always treated as different languages, even though they're highly mutually intelligible. Then there are the Czech and Slovak languages, extremely similar but not considered dialects.