https://libreboot.org/docs/install/t480.html

It’s a significant improvement to me that it’s open source and that - according to the above description - Intel ME is indeed removed.

Have you flashed Libreboot on a T480, then taken a dump of the chip and confirmed that Intel code is still on there?

I also don’t understand why I would need grub when I use systemd’s bootloader. I only want to replace the BIOS.