yes can be removed although not from grub.cfg. to begin with make sure you have microcode hook in /etc/mkinitcpio.conf for early loading of the microcode.
to remove microcode initrd line, add following line in /etc/default/grub
GRUB_EARLY_INITRD_LINUX_STOCK=""
rebuild grub.conf using;
$ sudo update-grub
BTW looks like plasma-6(6.0.1) has hit arch-stable. i’m anxious as some of us to nose dive this soon, though i dont intend to not update for long.
to keep other updates from coming excluding plasma 6 and KF-6 and kde-apps, do you think having following package groups ignored will be sufficient for the time being.
/etc/pacman.conf;
IgnoreGroup = kf6 plasma kde-applications