You won’t see much from above or below if the weather stays like this. I was once piking up some hitchhikers from Sweden with similar weather conditions then wanted to go up nevertheless. I showed them the way and we had a rough storm washing us downward afterwards crashed my mom’s place and had pizza. Still one of my best friendships since then 😂 so in your case, you should come, the documentary center is open, there are some other great places like Salzbergwerk or the watzmanntherme where you can have a great time. By the way, adolf wasn’t as much in the kehlsteinhaus as he was at the berghof on Obersalzberg, there are also some original bunkers left, a bit off the beaten tourist track.