Quote:... Should I rename the directory?
No.
The location of the Gimp 2.10 user profile can vary depending on the installation - flatpak / snap / appimage / from distro repository. Gimp 2.10.18 so guessing it is the latter. Regardless if you start Gimp then Edit -> Preferences -> Folders then expand the Folders section and the path to the correct folder is shown. Almost sure to be ~/.config/GIMP/2.10/fonts/
Same as Gimp 2.8 you can add a path to another folder if you want.
One thing to look out for, Gimp 2.10 will try and migrate settings & resources - scripts / plug-ins ...from ~/.gimp-2.8 to ~/.config/GIMP/2.10 and not all will be compatible. Review what is there.