Number 1 - the German Bishops don’t speak for the Catholic Church. Number 2 - The issue is not a church teaching in any event. Hiring folks is one think. Approving of their relationships is another. But the Church is clearly within its right of religious freedom to hire only employees whose lifestyles are consistent with Church teaching.
Sometimes I think most of the ills in the world are cause by Catholics who have effectively abandoned the faith and morals of the Church and conformed themselves to the worst of secular culture.
The world would be dramatically better if Catholics were Catholic.