Visited today without charging.
The parking in which the chargers are must be accessed through the spots hall parking. The signage isn't very welcoming, maybe it's my bad German but the signs sound like you are not allowed to drive through there, but that's the only access route.
There's something odd going on with chargers 3 and 4 (the DC chargers). Their QR codes don't work. They are currently not visible in evpass app anymore. But they are still visible on opendata. Number 4 showed out of service on the screen when I visited but if my ID map is correct that's the one that shows available on opendata 🤔
Evpass app says the parking is free, but this doesn't appear to be strictly true. There's 1h free but you have to register at the parking meter.