Seems like youtube-dl doesn't work anymore. I had to use a fork yt-dlp. Always makes me nervous hopping from one project to another like that, but seems like it's commonly used at least.
youtube-dl has been dead for many years now; it's a lot like XFree86, where the original project is a zombie with very few real users, but the original maintainers refuse to acknowledge reality and just shutter the thing, so newcomers get confused. Everyone's moved to yt-dlp now.
For providing a tool that lets people download YT videos? The same should apply to yt-dlp, but that project is hosted on github.com with no apparent problems. What's stopping the youtube-dl people from doing the same and just ignoring this silly court ruling?
