Those things happen everywhere, not only in Germany. Some are caught, some aren't. Some are fined, some aren't. Some are banned, some aren't.
I hadn't heard that news until i read this, but even if it's true you make it sound like Germany doesn't deserve to host the cup or something like that, just because of it (maybe you didn't mean it, it was just my idea looking at the topic. If not sorry about that). Anyway, even if it meant german referees were all like that, which is a dumb stereotype anyway, the world cup will have referees from a lot of countries (i don't know the exact number) which have been selected by FIFA for, arguably, being imparcial in previous football events.
btw, it's not that hard to understand what Matzat writes. Don't exaggerate it.