It's been around since newpipe & idk if you know this but newpipe has been abandoned which was continued under a new dev calling it newpipex. I am not sure if newpipex is still going or if that stopped as well because newpipex started years ago as a replacement to newpipe x sponsorblock.
You can tell if you're getting the http 403 when trying to load a video. That yeah it no longer works. So I been using ytdlnis for a long time you can still watch, download videos & convert to mp3.