I don't understand your point. It says "The uploader has not made this video available in your country" for me, so it looks like ARD did that on purpose. They could have hosted that on any server and blocked you by IP address.
We have Fair Use in the US, which is the protection you seem to be grasping for, and while the concept is weaker in the EU, even with stronger protections it makes no logical sense to depend on the person who wants to (over) enforce their copyright to distribute their works freely under fair use. Even without any copyright at all, you still wouldn't be able to force them to distribute to everyone. You might as well mail them and ask for a copy, and, when they turn you down, call for a post-Postal-Service world.
You can, however, look to others to distribute the work, and as others have said below, the interview is available online[1]. If you think fair use in this case is important and someone tries to get the interview taken down from the Internet Archive, I suggest donating to hopefully get some good precedent behind them.
[1] https://archive.org/details/snowden_interview_en