I wouldn't be so sure... I forgot to mention that holocaust denial is illegal, holocaust denial INCLUDES arguing that it was on a lesser scale.  I know you're not the one making the argument, but even depicting a person doing such a thing will offer you little protection.  

Germany's very over the top on this subject.  To the point that I think it's significantly detrimental.  

Suffice to say: expect this to happen every time you cover such a topic like this.  Either plan for it by removing all offensive materiel, or go into this understanding that you're probably going to get (unjustly) blocked in Germany.