Oh OK my bad, that was news to me. I stopped using it a couple of years ago when Firefox got the functionality built in, and it wasn't advertised as an ad blocker back then.
It's on F-Droid. I personally haven't used it in a long time because you couldn't sign in to your account. Not sure if that's changed. I'm currently using revanced which is great.
As the other poster said, it's on F-Droid. It's mostly a Youtube frontend, although it accesses SoundCloud and PeerTube too. And more importantly, it doesn't download advertisements from YT, so you don't even need an ad blocker when using it.