You are setting up the experiment as if we took one guy and decided to follow him for 6 years to see if he could beat the market. Instead a reporter found one

You are setting up the experiment as if we took one guy and decided to follow him for 6 years to see if he could beat the market. Instead a reporter found one out of a couple of million investors who did well the last 6 years and decided to interview him. I don't see why you feel talking about survivorship bias is unsound in this case.