Hi there!
This is a fully underground station, like a metro station but the vehicles going here are trams. Picture here
https://fr.wikipedia.org/wiki/Marabout_(métro_léger_de_Charleroi)#/media/Fichier:Station_Marabout.JPG
There are 10 stations in Charleroi like this, station=subway is used there. I had checked other cities with underground trams like Brussels and Köln.
Do you think there is a mistake with this? We can change it.