And do i really have to symlink this folders ?

No, you don't have to have those symlinks configured. Rancher Desktop prints those messages because it bundles the latest versions of

docker-compose

and

docker-buildx

, and then uses those symlinks to make them usable. But if you've already got them in place (and you don't care about having the most up-to-date versions of them) you don't have to worry about it.