I cannot find any official website for this parking, but I see it listed on the various indexes like Parkopedia and Parking.ch, so it seems to be a public parking. They both say open 24/7, first hour 1CHF.
On eCarUp the chargers are indicated as operated by "Indigo Home GmbH". No max power is specified. The picture shows 3 of the 4 chargers, they are Juice units with attached cables, the parking spaces are reserved for charging and the numbers go from right to left.
Chargers 3 and 4 were visible on eCarUp on or around June 16. Chargers 1 and 2 appeared later on or around June 23.