Hi @RichiG84,
In general outputs from whatever *-=fetch program you use, like the one provided above is of little to no use. Therefore, in the future, please see:
However, I have a custom keyboard delay/repeat rate as well, and I recommend using this method you mentioned:
https://wiki.archlinux.org/title/Linux_console/Keyboard_configuration#Systemd_service
In Gnome, I have no idea what to set where as I use Plasma.