The numbers dont make sense. The rate is 8.07 per 100,000 over the 6 years. This rate would be the average of the 6 annual rates...not a cummulative total. So they shouldnt be dividing by 6 to get 1.34 per 100,000.
From the video on the news this morning it looked like the rope from the boat was attached to the front of the board. His rope is attached in a different spot so he isn't absorbing the force.