Tried to visit today while walking around Thun, but I did not find a way to reach this location. All the roads from the south seem to go through the fenced off army area.
Looking at satellite pictures, I don't see any gate on the road coming from the west but it was too out of my way to try and go this way.
We don't see the location from the Alpenbrûcke bridge. However I saw the charger from the train on my way out. What I saw matches with the picture on evpass, a NetworkTwo charger with the evpass brand colors in the middle of a small parking lot. There doesn't seem to be barriers between the parking and the road that leads to it.