Walked by yesterday.
These chargers used to be listed on eCarUp with the mention usable outside business hours, like other Emil Frey locations. But in July they disappeared from IchTankeStrom and eCarUp. The old payment page URL no longer works, so they must have been completely disconnected from eCarUp.
I didn't see where the AC connectors were, but the DC is near the gas pumps. Everything was hidden by a lot of parked cars in front, I was not able to see if there were still (or ever) any QR codes or instructions.