Interesting, the problem of deleted content is ever growing. When I look at my liked videos on youtube every 10th is unavailable without any information/title/thumbnail, there's no way to tell what it was. Very frustrating indeed, that's why i save every video i find valuable
Fortunately we still have the YouTube urls. A quick google has for me led me to Reddit / older forums to find the context I needed to search for a re-upload
https://git-man-page-generator.lokaltog.net/
and it's been submitted here a lot but mostly marked dead apart from very early submissions:
https://news.ycombinator.com/from?site=lokaltog.net