I believe the idea is that searx strips out tracking/data from the queries sent and recieved from engines.
There’s some info here
As for the browser tracking you, yes. It doesn’t matter what search engine you use on a browser like Chrome it can still track you.
If it’s on Deezer https://free-mp3-download.net is your friend.
didn’t know libredirect could redirect to Freetube, I’ve just been having mine go to an Invidious Instance… I’ll have to look into this.