https://www.qubes-os.org/doc/releases/4.2/release-notes/
- dom0 updated to Fedora 37 (#6982)
He didn’t say you are wrong. He said that you do not need to change grub in Qubes 4.2.
In 4.2, dom0 is fedora 37 and have the systemd-cryptenroll package.
(therefore, you don’t need to change grub to unlock LUKS with a security key).