Bodysurfing behind the boat whether inboard or not is stupid. I've seen too many accidents while boaters were practicing safety measures - no need to increase the risk. Skiing with no life jacket is irresponsible - just as hanging off the swim platform while the boat is operating. The rigs are not designed to do this.
Would've been a non issue if he scurfed/ski'd/wakeboarded behind the boat at a safe distance. On my boat I'm the captain - that's the first rule....and I am familiar with safety measures, laws, and local regulations. I take responsibility for the crew on my boat, just as this man should.