But for some reason you didn't bother to use your own search engine:
https://you.com/search?q=youtube-dl&fromSearchBar=true
https://yt-dl.org/ is the homepage, and you.com has the same results as https://www.ecosia.org/search?q=youtube-dl&addon=firefox&add... and https://duckduckgo.com/?q=youtube-dl&t=h_&ia=web
It doesn't list the homepage...
It looks like it's missing that url you mentioned but, I see tons of results on how to use it, where to download it, the correct github page with details, reddit results describing how to use it, etc.?
Seems quite useful to me, no?