I don’t get that deprecated message when clicking Update System (yay).
I checked the file: /usr/share/endeavouros/scripts/welcome and it seems that this message is not coming from the Welcome app, it is coming from pacman itself. Someone correct me if I’m wrong about this please.
UpdateInTerminal is deprecated for a few reasons. Mainly because there are good “alternatives” for it, like pacman and yay.
Also, there’s also eos-update which is capable of checking the mentioned Nvidia thingy, among other additional features like the keyrings.
But UpdateInTerminal is still used by eos-update-notifier, so it will take some time to handle those two apps in a reasonable way.
The plan is to eventually remove UpdateInTerminal, then think about what to do with eos-update-notifier (which may be “minimized” in the future, but that hasn’t been really decided yet).