It's to make Gates look better, damage control. He didn't say anything new, he just pimped his charity -- AND if you recall Gates was once criticized for how little he gave, that's why he made his Gates Foundation in the first place.

He repeated the same thing that's already been approved for release about Epstein while seeming uncomfortable about the situation, which he was probably coached to do. To make him seem more human and relatable. The message seems to be: Here's a bad situation Gates kind of stumbled into, but it was for a charity, and he really didn't do anything wrong.

Now that might not work on you, you see this video as confirmation of your own beliefs, but you're not the target audience. People on the fence are. People without strong feelings on the subject anyways. It seems like a reasonable explanation if you don't really care one way or the other.