Kampfner seems not to be totally wrong. But it is not anti-democracy, it is democracy what he criticizes - as is is written in your article here: Judges are able to bring politicians under control by using a system of traditional values, which are written down in a constitution. Compared with other constitutions (or not down written values) the German Grundgesetz (=basic law) is not only a summary of values. It's a law which politicians have to follow like every other citizen - and which they are able to change on the other side - except they like to change what we call "the spirit of the constitution" = the basic elements of our democracy and the basic element humanity. "Human dignity shall be inviolable. To respect and protect it shall be the duty of all state authority."
And another question in this context: What are we doing better?