Visited on January 12 without charging.
The chargers are in the outside parking, accessible 24/7. Given the signage it seems open to everyone like the 180+kW chargers, and parking is free. You can enter the parking from either end.
Both chargers must have been retro-fitted as some point. Like in Bern, they seem to have been original ABB 20kW chargers from 2014. The left charger has an updated sticker on top of the original sticker showing 50kW. The right charger still has the original spec sticker saying 20kW.