I think people read these notes for the "big ideas" presented, not for the majestic prose of Bill Gates. Given that, why do you care who assembles and copyedits the information for him?
I think if someone is going to use their personal name on a website, they should actually write it. Otherwise, it's deceptive. If it's going to be a team effort, then call it a different name, and don't show a big picture of your face at the top of the screen.