What's so hilarious about it? D3O is a non-Newtonian fluid, and its properties change depending on the forces applied to it. Its application in racquets may or may not live up to the marketing hype, but there's no reason to discredit TennezSport for confirming that the material, itself, does what the manufacturer claims it does.
Sure there is a reason to ridicule his claim. He is trying to position himself as an authority in the matter by stating he holds the racket and can confirm that it works as described. It is obvious that just by holding to racket you cannot confirm or infirm what is going on at a molecular level. The same way you cannot confirm that a car can break the barrier of sound just by judging its color. "By looking at the exterior of this deep red automobile and I can confirm that it does 800mph." or "I hold the Enquirer in my right hand right as I speak and I can confirm that Jennifer Lopez rear end weighs 65 lbs".