Questions about the install-grub script

What exactly is meant by “zfs is not currently supported” on the original announcement for install-grub?

Don’t install if you’re using zfs?
And has that changed since 2023?

efibootmgr shows BootCurrent: 0000 and 0000 is where you’d expect it Boot0000* manjaro HD(3,GPT,8f56517c-146c-5e42-9a84-114368846df6,0x3a28357e,0x102a91)/\EFI\MANJARO\GRUBX64.EFI.

And /boot/efi/EFI/Manjaro/grubx64.efi exists, but with an updated date of Apr 10th 2024…

Running sudo install-grub reports:
WARNING: EFI directory not found! Grub couldn't be installed.

So does it error because I use zfs?

UPDATE: Ran sudo grub-install and grub-mkconfig. grubx64.efi update date is now today.