Holding back a bit here, but yeah, it sure works similarly to Kart's original release.
I agree with others when I say this mod is now kind of redundant given followers can now honk, but I'm going to add on to that and say it's disappointing to see how straight a port this is, down to the old video & lack of info on the page. I would want to see this tie more into the Follower system for later releases, with options to do things like just using their horns without looking back, having their sounds available as well, and I'd even say the option to just use their horn graphic would be nice because it looks quite jank to my eyes that it's used twice.