As being from Germany, having worked in and following the local industry, I wouldn't be too surprised if there's some truth to this. However, I'm having a hard time believing they didn't pay period, for months. All I can find about it (which is weirdly enough not much from German sites or the usual news portals) is that payments have arrived late (as in 1-2 weeks late), which seems more believable.
I dunno, I heard about Crytek's, well, unique financial handywork, but this seems a bit much. Not saying it's wrong yet tho. Also, if you work in Germany for 6 months without payments, you're a fucking idiot and clearly should read up on labor rights (and job offers from elsewhere).