No, it was defamatory.  Prussia was abolished by the national socialist party and it's symbols (the Prussian death's head) were misused by the SS.  The National Socialist Party was a Bavarian party.  Prussians often did not take to National Socialist propaganda, especially near the end of the war.  And if you just had to put the hitler salute in the article, why didn't you put the roman salute too?  This in itself shows that you are trying to link the GNP with national socialism.  You're simply trying to link the GNP with anti-semitism and racism which it does not promote.