This question is about an issue affecting an ex-pat Belgian citizen. It doesn't have a tag indicating the location, mainly because there isn't a suitable tag. There is a tag "Belgium", but that is for "issues affecting ex-pats in Belgium" (my emphasis).
It only has 28 questions, which suggests that adding a few more won't overload it. I suspect that many people who watch the "belgium" tag are likely to be able to offer advice to citizens too.
Adding a "belgian-citizen" tag feels like overkill, but it is the obvious alternative.