EOS updater (terminal) shows
Missing AUR Packages: eos-base
Operating System: EndeavourOS
KDE Plasma Version: 5.21.5
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.2
Kernel Version: 5.12.4-zen1-2-zen
OS Type: 64-bit
Graphics Platform: X11
Processors: 8 × AMD FX™-8350 Eight-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GT 630/PCIe/SSE2
EOS base should not be in the AUR, but part of the EOS repo.
Try reinstall of the package?
sudo pacman -S eos-base
eos-base is no longer in endeavouros repository. That must be why the system identifies it as having been installed from AUR.
so, can eos-base safely removed?
I guess so. I don’t have it at all in a recently installed EnOS.
For any PACKAGE, to see what is dependent on it you could run:
pactree -r PACKAGE
it was never installed per default so you have installed it manually.
So yes uninstall it.
sudo pacman -R eos-base
eos-base was an experimental meta package (it only contains some other packages as dependencies). It was never really needed.
Whenever you remove a meta-package, pay close attention next time you remove orphans to make sure there is nothing there that needs to be converted to explicitly installed.