BR will only be German, Bavarians barely speak German they certainly won't do English. The arte doc is produced by the BR, same author, it definitely contains earlier material dunno if that's the one I watched, it's kinda unlikely because I don't tend to watch BR, but it might've made its way to the ARD. Also I think the one I watched before was only a month or two after the start of the "three day operation".

...which is all to say seems like there's a BR journalist hanging out in Würzburg (which is in Bavaria) churning out documentaries about the community.