Visited on April 6 and charged with credit card.
It was a Sunday and the access road was not closed. To access the chargers you indeed need to drive under building 10 at the entrance that says "Schorenwrg 10 & 44 - welcome".
There are "Privat" signs on each side of the access road, but I was not able to get a closeup of what the text says underneath. I assume it says for visitors of the park. After that point there aren't any more instruction apart from the EV sign and the various "visitor" parking directions. The map at the entrance also shows an underground parking whose entrance is to the left of the chargers, but I don't think this part is completed because it didn't look like that parking was operational.
There are no lines painted in front of the chargers. There should be enough space to charge 6 cars, if everyone parks adequately. To the left of the chargers there is a big machine which I guess is an air conditioner. It probably won't stay there once the construction work is done.
Both chargers have the built-in EVTEC contactless reader. The contactless price is 49ct/kWh+10ct/min, 1 cent cheaper than eCarUp.
While I was charging a group of people walked through the area. At first I thought they might be security, but it seems like they were just loitering around. I wonder if there's any reason to be in this area on a Sunday, as there doesn't seem to be anything around except the business park.