Does anyone know if Zerbu's Unlimited Likes and Dislikes is still working?

Yes, I have it in my game. It doesn't matter how long it's been since a mod was updated if the mod hasn't been reported broken and the modder is actively supporting the mod. Zerbu is still an active modder.

https://scarletsrealm.com/the-mod-list/

You can check this list to find out which mods are currently broken or unsupported.