Earlier quoted context omitted.
What do you mean by 'Belgium is not a nation state', if i may ask?
They probably mean that Belgium consists of French-speaking and Dutch-speaking (and German-speaking) groups, which the person counts as separate nations, hence Belgium not being one nation. This is mostly a language confusion for non-native English speakers. Nation, country, state, a people, nationality, ethnicity, citizenship etc. are used in confusing ways for speakers of other languages. For many, "nation state" j…
> ... because just saying "state" could mean a subdivision, such as a US state ...