Green text probably isn't true but I did have a German professor born and raised in Germany with a Master's in "Conversational German" so it's definitely not impossible.
If its a German degree - Germanistik is different from just German courses. It's more about German literature - how the language evolved, why things are the way they are, analyzing uses of language and so on.
Not really a useful degree, but a degree you need to put work in nonetheless