That's your Garuda /boot. I meant in your Arch installation, you will have to look in /boot and make sure you see a kernel and an initramfs. It seems like Grub is not finding anything to boot with.
If /boot is empty, from the chroot you will need to install a kernel, then build the initramfs.
pacman -S linux
mkinitcpio -P
After you confirm you have a kernel and initramfs image in /boot, you will have to update the Grub configuration file again.
grub-mkconfig -o /boot/grub/grub.cfg