Visited yesterday without charging.
It's not clear whether any charger is supposed to be public.
There are 3 AC chargers from Chargepoint. The middle charger has a sign "Dies ist keiner öffentliche Ladestation", but the other chargers don't have such a sign. So is the sign supposed to apply to all of them, or just the middle one? The price screen on the Chargepoint chargers shows 0CHF/kWh, so it's probably not meant for the public.
The DC charger doesn't have any instruction, but there are Mobilecharge QR codes on it. It seems like it's a special Mobilecharge profile where you need to register before you can see the prices, instead of the regular ad-hoc experience where no account is required. I didn't try to go further on the payment page.