While he is apparently wanted in Germany, a run-of-the-mill assault case doesn't trigger an international arrest warrant, and there's no other system that would share such information with foreign visa offices, except possibly the US. It was shared with India in this case only after he became an "issue".

I don't quite understand what the German bureaucracy is supposedly doing differently in this case due to this arrest warrant. I'm somewhat certain that it wouldn't change anything until he sets foot on German ground again. Germany would have both an interest in him returning (for justice, and to prevent any more international embarrassment this guy might provoke), as well as a responsibility to assist him that doesn't just go away if you commit a crime.