The article title is a little missleading, or have not the same signification for "nachtclub "as we use in OSM. 

It's primary a record label that organize recuring event at Nostalgia. They (https://kbopub.economie.fgov.be/kbopub/toonondernemingps.html?ondernemingsnummer=838798590) dont' register a new establishment units 

It's the same case as the Demence in Fuse, we don't create a nightclub for every recuring events otherwise that create duplicated place. 