Like I stated, it just doesn't make sense. According to your version of the chat, his statement would have implied he's Mafian, not the secret role. There's no evidence that says the other players are not the secret role, so it can't be German. So we can eliminate him.
Now, LTVmocs, Whaddon, and BioKnight all could be the secret role. There's just no way of knowing, so a guess will have to do.