NAZI: Acronym for the “National Socialist German Workers Party” or Nationalsozialistische Deutsche Arbeiterpartei (N.S.A.D.P). Hitler joined this party on September 12 1919 and became its leader in 1921. The party was banned in 1923, but was re-established in February 1925 and took control of Germany in 1933. After Germany’s defeat in World War 2, the Nazi Party was declared illegal by the Allied powers.
source: http://www.holocaust.com.au/glossary.htm
I do not consider the New South Wales Board of Jewish Education to be the final authority on the meaning of acronym.
The term ‘acronym’ was coined by Bell Labs as “a word created from the first letters of each word in a series of words.”
For that matter, USSR isn’t an acronym either (how would it be pronounced as a word?).