Visited on February 16 without charging.
I'm not actually certain to have found the correct charger, but this must be the place. I didn't see any charger outside. Down the ramp in the underground garage there are 2 charging stations with the name "Baumann Elektro".
eCarUp indicated that the station was occupied while I was there, so I guess it must be the pico station.
There is no indication whether the charger is open to the public. The QR code on the pico can probably be used to open the ad-hoc page.
I'm not sure whether that garage door stays open. I didn't meet anyone I could ask. It seems like visitors are usually expected to park outside where there are parking spaces designated as such.
There is CCTV in the underground garage.