The “ads” they’re talking about are the ones placed directly in the video by the creators themselves. YouTube doesn’t control those and no ad blocker can get rid of them. To do that you’d need a vastly more sophisticated kind of ad blocker that actually watches the video and understands the content enough to decide what part of it is a sponsored message. We may be getting close to having that kind of technology but it would take a pretty big step up from something like CharGPT.