The YouTube-DL website notably does not come up in those search results, it's their GitHub page that does. The website does appear in the sidebar, because it pulls the sidebar data from Wikipedia, and YouTube-DL's Wikipedia page does come up.
Interesting, mine are github, videohelp.com, and then ottverse.
I imagine that adds credence to the theory that it's because of Bing's index removing them - maybe they use a different index in India?
Note that if you do a google search (https://www.google.com/search?q=youtube-dl) their website is the first result.