It's been known for a while this is just verification. Accounts give themselves away all the time accidentally through phrases or tells. eg: A tweet from an account claiming to be from the US talking about Texas succession that mentions 'warm water ports', very few people care or think about that because all the ports on the continental US don't freeze over in the winter. (In fact very few countries do because most have as many warm water ports as they need, one of the few with significant issues with this is... Russia)