You've done a great service to the community, but if I may ask, why cash out 100%? If Bitcoin was good to you, let you retire, gave you your dream house, why not be good to it? At least hold onto a handful of Bitcoins and watch the future unfold with the rest of us.
I guess the money sometimes gets the best of us, and we're all tempted to the wealth in many forms.
I don't think he cashed out everything, but most of it did get converted to fiat, but if by some chance bitcoin price goes down, he could just rebuy lower and hold even larger amount of bitcoins then.
cheers