That looks like the grub file that’s put in /boot to make the menu to boot the system.
Are you sure you’ve never run “grub2-mkconfig -o /etc/default/grub”? Because making the grub file you may have overwritten the config file.
By the look of things I would reinstall grub with my package manager to forcing to overrun config files. Keep in mind this would return the file to your distribution defaults.
Great news for nvidia users.
Not sure if this affects my Pascal card at all (probably not as it’s specifically not mentioned). I barely use the dedicated GPU anyway.