Ludwig van Beethoven was born on 16 December 1770 in Bonn Germany.
It's a joke about Austrians. They like to tell themselves that Hitler was German and Beethoven was Austrian. It was going around a number of years ago when for whatever reason the Austrian/Nazi connection was in the spotlight. Some think the Austrians are in denial about any connections they had with The Nazis.
I kinda thought it was. Umm, so I apologize for the confusion.