It's irrelevant. The topic is a defense of equating a country flag with a language. Even if you have 2 in one country then you've already proved why its a bad idea
The thing that makes it a bad idea is ambiguity. But most types of ambiguity in this situation only apply to the list of supported languages. If the languages aren't supported, the problem doesn't exist. So yes it's relevant.
And there's only a couple countries in the world where this is a serious issue anyway. It doesn't make flags a terrible idea for the rest.
