Marius,
I believe the "German Clues" were meant to mislead Dutch Hunters. They were created, like many maps, clues, etc. by people familiar with the range and the different legends. They contain enough facts to enable anyone trying to follow them to be encouraged.......just as you are. It's unlikely they will lead anyone to great riches. If they could, the people (person) who created them would have already removed anything of worth.
This is not meant to discourage you from following your dreams, just to open your eyes to something/clues that many Dutch Hunters have looked at for years and eventually discarded. Jim Hatt had this exactly right. Mark this date, as you won't often hear this from me.
Good luck,
Joe