Visited on Sunday without charging.
All chargers are freely accessible without any gate.
I didn't see any instruction posted. In the eCarUp app the description says "Für Emil Frey Kunden".
The chargers in the south area and Wekstatt area seem to have QR codes for ad-hoc payment. The chargers in the west "EVite" area don't have QR codes.
I wonder why they kept the "EVite" sign. It probably exists from a time when the charge might have been free. Maybe there was even a different charger model here, I'll need to try to find historical pictures. But now it kind of contradicts the eCarUp description, as the EVite sign used to mean public charger for everyone.
The area is huge and the 3 charger areas are a little distance away. In the middle of the lot there's a totem that has an arrow for "Ladestationen". It points towards the "EVite" chargers.