The argument would be that the average user is expected to understand these privacy controls in order to make decisions about their data. If even the CEO of google, who is well positioned to be able to understand them if he chooses, doesn't understand them, then the average user has little hope.
He should probably have some familiarity with the things about which he's testifying in court.
>why is it that somehow, the CEO is expected to be an expert in everything that the company outputs?