It would be standard mod practice to replace https://backreaction.blogspot.com/2024/01/i-used-to-not-worr... with a link to the video, since the blog post is just a thin wrapper around it. As the HN guidelines say, "If a post reports on something found on another site, submit the latter." (https://news.ycombinator.com/newsguidelines.html)
Why the wrong video made it in, I don't know, but most likely it was a simple copy-paste error. Sorry, all!
Edit: oh it might have been that one of us saw >>39157418 and mistook that for a comment of this sort: >>39163616 .