It's not a 7 year old child, it's somebody who has played the piano for 7 years and studied this piece for 1 year according to himself in the YouTube comments. Still impressive.
Gosh! Don't any of you know that it is EASIER to play with the eyes closed once you learn a piece? Concert pianists, jazz players, etc., do it all the time, sometimes looking at the audience and even talking. No indication of any special talent. When eyes are open, a tremendous amount of video bandwidth enters the brain, requiring enormous amounts of mental processing. When eyes are closed, all this brain power is released to play the music and makes the task easier. Try it yourself; with just a little practice, you will soon be playing with eyes closed just like this fellow. It is especially simple if you know Mental Play and memorize using what I call keyboard memory.