You make your note in the beginning of the winter.  So there is no way to verify.
Even if it is not working at some moment, that does not mean a thing.
Drinking waters in Flanders are very unreliable.  This one is surely ment to be used.  I don' t know why it did not work when I discovered it.
The problem here is not the drinking water fountain but the lack of good OSMers in that region.