Honestly, the reason this and other similar places around Athens are tagged as "suburb" is due to the Greek translation of "suburb" (προάστιο) and that these places are referenced as "suburbs" in the everyday language, even though they are officially recognized as separate settlements (per Greek census).

I understand this creates a confusion when a suburb is typically considered part of a city, but when it comes in metropolitan areas like Athens and Thessaloniki, it's kinda weird to how properly tag them. A discussion with the Greek community should be done just to ensure this.