It's an unfortunate use of Youtube embeds. Aside from letting people uncharitably dunk on them, the Youtube here isn't even doing anything. The YT video in question is https://www.youtube.com/watch?v=_1Y8PwD5XDs , which is 57s long, has 2 worthless comments, no description/metadata/playlist/closed-captions/categories, and a yt-dlp takes literally 5s for me to download the 1.5MB MP4. (Which I think may actually be about the size of the full weight of the YT embed container based on the last post I saw here whining about YT embeds...?)
This is a perfect candidate to host yourself and just slap it in some <video> tags.