seems like a forgery to me, with peculiar mis-en-scene as if his scope was a camera in an 80s splatter movie. and it also raised many doubts in german forums.
are there any other sources about this guy?
he doesnt appear in official knights cross recipient lists (claims to have received it on 20. april 1945)
the other famous sniper Matthias Hetzenauer appears in a list and is overall much better documented
http://www.lexikon-der-wehrmacht.de/Orden/Ritterkreuz/RKH-R.htm