RR doesn’t want a professorship in Germany. Why would he? He is at a top department better than almost all German departments, his family is in the US and unwilling to go to Germany. Why does anyone think that he is searching in Germany?
US bro
Simple. He says he wants a professorship in Germany. As to the "top department" he is at, the reality is that it is a mediocre department in the middle of nowhere. You can't blame him for wanting to leave to an even lower ranked German department. Quality of life matters.