It seems that only applies if your work falls clearly within a few categories of exceptions. For example, Wolfenstein, a game about a Jewish commando fighting against the Nazis, was censored in Germany to comply with the law.
> "In Germany, we've removed all Nazi symbols and references. Unlike films and other works of art, video games in Germany are forbidden to use such symbols and references as they are classified in Germany as toys and not media art." The illegal display of Nazi imagery is punishable by three years in prison in Germany. (http://www.bbc.com/news/technology-27488254)
Even "Maus: A Survivor's Tale" struggled to be published uncensored. They eventually succeeded in convincing the culture ministry to allow publication, but it's not enough to be anti-Nazi.