I tried to visit on Sunday but didn't find a way in.
According to the eCarUp coords, the chargers are at the end of this private road. I saw 2 different entrances, the main FORS front parking entrance seemed completely closed for the holiday. The more direct entrance down the road also had a gate but there must be a way to open it, as it also gives access to the Gesundheitszentrum. When I was about to leave I saw a car exiting, the gate opened automatically for them. I didn't try to enter.
I didn't see any charger in the front FORS parking and I was not able to spot the chargers at the end of the road from the fence.