How could this happen? You most likely screwed your system with this setting. Manjaro is not Arch, mixing repos from different distros is a pretty safe way to irrevocable corrupt your filesystem. Even if you get your current issues fixed there might be hidden deficiencies. Better safe your data and reinstall.
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from live
lsblk -fs
and in chroot
inxi -Fza
parted -l
cat /etc/fstab
I am totally not sure how this ended up here, as far as I am aware, I did not add it in on purpose in the last year.
It’s not getting there from alone, please be honest.
I am honest, as far as I can remember I never touched said file. But I know what you mean 
~ lsblk -fs ✔
NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINT
sda1 vfat FAT32 1ABC-8020
└─sda
sda2 crypto 1 xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
└─sda
sda3 crypto 1 xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
└─sda
It’s not a problem to make a huge mistake (we all do from time to time ) but you should not hide it when you are looking for help. This would not be fair to the people trying to fix your issues.
Anyway, using a Arch core repo is most likely toxic. I would not say impossible to fix but risky as you never know if you covered all deficiencies. Better safe your valuable data and reinstall. Take it as lesson.
I understand you, and I did not try to hide it. As soon as @stephane told me to look at the file, I saw the line and pointed it out 
so I think I tried to be as helpful as possible
are you using sda2 & sda 3 as raid 1 disk
According to the infos I got in grub, sda3 seems to be labeld as a swap partition
Do you need anything special from inxi -Fza?
line boot kernel , and info about partition installed
[manjaro-gnome /]# inxi -Fza
12System:
12Kernel 5.9.16-1-MANJARO x86_64 12bits 64 12compiler gcc 12v 10.2.0
12parameters BOOT_IMAGE=/boot/vmlinuz-x86_64 lang=en_US keytable=de tz=UTC misobasedir=manjaro
misolabel=MANJARO_GNOME_2021 quiet systemd.show_status=1 driver=free nouveau.modeset=1
i915.modeset=1 radeon.modeset=1
12Desktop GNOME 41.2 12tk GTK 3.24.30 12wm gnome-shell 12dm N/A 12Distro Manjaro Linux 12base Arch Linux
12Partition:
12ID-1 / 12raw-size 878.98 GiB 12size 864.19 GiB (98.32%) 12used 313.17 GiB (36.2%) 12fs ext4
12block-size 4096 B 12dev /dev/dm-0 12maj-min 254:0 12mapped sda2
12ID-2 /boot 12raw-size 300 MiB 12size 299.4 MiB (99.80%) 12used 73.6 MiB (24.6%) 12fs vfat
12block-size 512 B 12dev /dev/sda1 12maj-min 8:1
[manjaro-gnome /]# parted -l
Model: ATA CT960BX500SSD1 (scsi)
Disk /dev/sda: 960GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 2097kB 317MB 315MB fat32 boot, esp
2 317MB 944GB 944GB
3 944GB 960GB 16.1GB
[manjaro-gnome /]# cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a device; this may
# be used with UUID= as a more robust way to name devices that works even if
# disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
UUID=1ABC-8020 /boot/efi vfat umask=0077 0 2
/dev/mapper/luks-9e5cb524-9427-4a0a-b016-a428e44cdd8b / ext4 defaults,noatime,discard 0 1
/dev/mapper/luks-399a5a8e-b6e2-4897-8a1c-ef88c1dd101c swap swap defaults,noatime,discard 0 2
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
have applied this on chroot mount ?
mount boot to /mnt/boot/efi? As I see in mine I should be in folder efi right?
Following at the end:
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=manjaro --recheck --verbose
..............
grub-install: info: executing efibootmgr --version </dev/null >/dev/null.
grub-install: info: executing modprobe -q efivars.
EFI variables are not supported on this system.
grub-install: info: executing efibootmgr -c -d /dev/sda -p 1 -w -L manjaro -l \EFI\manjaro\grubx64.efi.
EFI variables are not supported on this system.
grub-install: error: efibootmgr failed to register the boot entry: No such file or directory.
Looks like no efi then?
only if you need to re install grub and re create entry EFI
inxi -Mxa will tells you UEFI or something else
inxi -Mxa gives me only info about my machine and there stands 12UEFI
I do not need to reinstall grub as far as I am aware.
I am still at the errors:
error: file '/boot/vmlinuz-5.10-x86_64' not found
error: you need to load the kernel first
But grub itself appears
if you boot in EFI → /boot/efi → grub → dev mapper
if you boot in legacy or bios , grub cant locate /boot in this case
( unless this is a gpt partition with 8Mb bios_grub )