Huge thanks. Your message starts the understanding. And as well give a plenty of texts to read.
> EFI/debian/grub.cfg on the EFI System Partition contains filesystem UUID where grub files reside.
All parts are simple But when compounding them together become messy. In the Manjaro: /boot/EFI/Majaro/grub64x.efi - binary to start by UEFI. /boot/grub/grub.cfg - shell (?) script with configurations. /boot/vimlinuz.* - the kernel. And if call a `lsblk`. Only a /boot/efi with a binary is a separate partiton. Things become more clear.