JMO,
I think instead of “fake” you mean what is the country of manufacture. The Reading section has an article entitled “What is it – German or Chinese?” They weren’t banned from importing them, but rather saying they were made in Germany. Since you bought it in 2005, it was made prior to the ruling. They did not start making steins in Germany after the ruling because a cheap cost was still an issue of importance.
If you wanted a stein made in Germany, you got taken because they lied to you.