The "Free and Democratic" land of Germany blocks lots of things in the net. Mostly, its because of contractual issues. But not always. And they have a real problem with the rights of "the people". It is for instance against the law to post a picture of folks, who have all not given permission for you to do so. So you take a picture of a bridge, and have to block out peoples faces if you want to post it in the net. Car license plates also.
The following text was the only thing/reason it got when I tried to access that link.
WERE SORRY: THIS SITE NOT AVAILABLE IN YOUR COUNTRY.
Its "verboten" to display, for instance the Hackenkreutz, Swastika in Germany, (there are some exceptions). But if you do that in the net, the minders will shut you down. Big fine also. The whole world knows the Holocaust happened. Only a crackpot would deny that it not happened. But, there are crackpots in the world. In the states, you could post on the net, "The Holocaust is a Hoax", and people would say, "the boy is cracked". Here the Polizei would come and put you in the Slammer. Big fine. The displaying of literature that contradicts The Holocaust is reason enough to shut off your access to the net.
Its a different country, and they have different rules here.