It is a joke, the German chap quoted as the suspect is a professional footballer, not a DJ. The club does exist.

I can see the humour in it but I don’t think using real names and a real club is a good idea, especially as not everyone understands enough German (or would bother) to check details and it is not at all uncommon for artists (at least in the UK and USA) to attack and even murder each other over rivalry or musical differences.

What makes it less believable is a mainland European probably wouldn’t do something like that. They would be far more likely to shoot their rival dead with a rifle or pistol from a distance (and then ride off a bicycle as a getaway vehicle!) or spike their drugs with a PMMA pill or three. but even then that is extremely uncommon as there is so much more tolerance of EDM events in city areas and music/arts as a whole there is no need for anyone to take such extreme measures.

In East Anglia during the heyday of tolerated club events in the 1990s one of the top house DJ’s got seven bells of shit beaten out of him on the doorstep of a club (to the point he landed up in Addenbrookes) by someone attacking him with bare hands and feet. The motive was unclear but simple jealousy or anger is as possible as any involvement with “gangsters”. He did make a recovery but suffered some life long injuries, and this is cited as one of the reasons town nightlife is fairly controlled here.