I saw that over the weekend. Its a fake video. The actual jump is CGI and as it turns out it was a viral video produced to generate some buzz for the new version of Micro$oft Office.
A few clues is the splash was produced was not in the same vector/path of the person entering the pool. Also the splash itself was way too small for a person that size. And last a fall like that at those velocities would surely do some major damage to his spine.
With that being said... yeah it looks wicked cool!