IMO the Youtube title isn’t even accurate, it’s just clickbait. The HN title is a more accurate representation of the content. Also to back up my sibling commenter, Derek is known to trial several title and thumbnails within the first few hours/days after a video release.
Whops, I forgot that I had dearrow enabled, a browser addon that changes titles thumbnails on yt to community based versions.
While this is true, the video title on YouTube can and likely will change.
Veritasium very often changes the title and thumbnail of their videos shortly after release. Whether it's to squeeze some more views out of a video or because of some metrics they take note of I don't know.