Visited yesterday without charging.
I probably couldn't have accessed the location at all by car, because it's inside the camping perimeter and the camping is now closed for what I assume is the whole winter season.
The charger being "out of order" is probably also due to the camping being closed. They probably manually disabled it. The marker has actually been completely hidden on Swisscharge, but it's still visible on opendata.
The charger is left immediately after the entrance gate, in front of the bathrooms building. The coordinates on Swisscharge/opendata are wrong, it incorrectly shows the charger next to another building to the right.
There's a posted 3h time limit, which is extremely inconvenient if you are here to actually charge your car after travelling. Since it's inside the camping grounds I suppose you could ask the office to let you occupy the charger for longer.
I should have taken a picture of the entrance gate but it started raining right as I was taking pictures and I had to rush to a covered spot.