Sieg Heil in Germany

You're not too bright if you think reading about history in Germany is punishable by this law.

Even if either German or English aren't your native languages, you should still not take every sentence you read TOO literally. Reading about the history of the Nazis isn't the same thing as running around Germany and openly and flamboyantly acting out Nazi acts.

if i'm in a German Starbucks or Schtarrenbuchen as i believe they're called, and i tie my shoe lace in a knotsi, can i still get a Venti Kaffee und ein Kugel?

Not if your handcuffed to the railings outside for saluting with a running crowd.

No. There's an instant, automatic punishment: you have to write thousand times: "Ich darf so einen Quatsch nicht auf A2K posten." on hand-made paper, produced by yourself, in not more than the double of time you've read the Wikipedia article.