Visited on April 6 and charged on the CCS connector with eCarUp app.
There are a large number of chargers here in the eCarUp app. They are all named based on their color or location, but there aren't any details as to who can charge, apart from one that's named "Mieter" so we can assume it's not for the public.
On location, most chargers are accessible without any gate. The chargers to the north under a canopy seem to be for their company vehicles. All others along the building are visitor spots.
The DC charger doesn't have any special marking asking to leave the parking space free. It's even possible to park in front of the DC and use the AC next to it, potentially blocking the DC completely.
Some chargers have QR codes, but it didn't seem like all of them had one. There are actually new chargers visible on eCarUp since my visit so maybe those on either side of the DC chargers have been networked.
There are signs above the AC chargers saving clients charge for free. I assume you need an RFID they provide because the chargers are otherwise billed through eCarUp and are not free.
This is the first time I see an Alpitronic HYC_50 with a CHAdeMO connector. I wonder why they didn't install 2xCCS, it seems like it would have been much more useful. Maybe they have some company vehicles with CHAdeMO, but I didn't see any parked around the building.
In the eCarUp app, the picture for the DC charger shows a KEBA station to the right, but it has been replaced with an Easee as visible on my pictures.