I just realized you're probably asking about the relativity video, not the interview video. I searched for it on YouTube but can't seem to find it any more. It was a video of him talking about an error in standard presentations of the theory. I suspect he took the video down after learning more about relativity.

ETA: Found it. Most of what he says here just sounds like nonsense. The fact that the video is no longer on his own channel does suggest that he's come to realize this.