Broken Grub after messing with partitions (BTRFS inside)

[20c]

I switched to Linux Mint several months ago. At the time, I installed it as a dual boot, but never really looked back at Windows.
So today I decided to reclaim the space: deleted the recovery partition and the windows partition. And after reading a lot of confident post about Boot Repair, I decided to go ahead and resized/moved all my Linux partitions using the live CD: swap, root and home. From the live CD again, I ran Boot repair which didn't complain.
It is worth noting that I'm using BTRFS both on my root and home partitions.
Now I can see my system in my EFI choices, but Grub seem to be very unhappy. I basically only have the grub shell and no menu or anything.
...
Help ?

The boot info generated before the "repair": https://pastebin.com/daNEtD82
The logs from Boot Repair when I first tried it: https://pastebin.com/7mdKKbxv
And the current boot info report is here: https://paste.ubuntu.com/p/9cGzRhVzrM/

[ajgreeny]

Moved to MINT.

Mint is not just another version of Ubuntu even though it is based on it.
There are many differences between the two distros and the Mint forum at forums.linuxmint.com may have better answers for you.

[20c]

Thanks for the move. I did post there as well.

[oldfred]

Are you sure you are booting in UEFI mode?
You have an old BIOS mode grub in MBR that will not boot and could be what you are booting.

[20c]

Yes I boot via EFI with secure boot disabled. That's what I had when Windows was still there, and I didn't change the bios settings.