To solve your issue with updating - yes
The manjaro related packages is obsolete and has been removed from repo - you don’t need any of them.
If there is something you really must have - make a note and rebuild them after a succesful sync.
To remove them
sudo pacman -R $(pacman -Qqm)
Then run a full system sync
sudo pacman -Syu
Please note that building custom scripts using AUR implies using as a minimum Manjaro testing branch.