From memory, Gnome 42 has 3 new apps: Text Editor (GTK4 replacement to Gedit), Console (GTK4
replacement to Gnome Terminal), and a new screenshot experience. That last one I’m not sure if it’s integrated into part of gnome-shell or not, but it’s not an app per se, it’s part of the desktop. So in order for you to use the new screenshot tool, you have to know the keyboard shortcuts. To access it, press your Print Screen button on the keyboard and it’ll open up for you to use, press Esc to quit/cancel it. So if you’ve installed Gnome 42, then you do have the new screenshot experience. The article you linked also mentions the various commands to use for it.
Just keep in mind new Gnome apps don’t always just go right into the Arch repos automatically (unless it’s a core package), they still need someone to package it and maintain it and since both the new Text Editor and Console are not yet fully featured, fully functional replacements, they are just going to be in the AUR for now.
If your current terminal is Gnome Terminal or Tilix or anything else really, there’s no need to switch to Gnome Console just yet, it’s still in the early stages and it’s not yet meant to replace Gnome Terminal. Feel free to tinker, bug report, or experiment with them if you like though, it is your system after all!
In regards to Gnome Console, the devs have stated:
We are not however trying to replace GNOME Terminal/Tilix, these advanced tools are great for developers and administrators, rather Console aims to serve the casual linux user who rarely needs a terminal
In any case, feel free to read more about them and install them if you fancy!
Gnome Console - https://aur.archlinux.org/packages/gnome-console
Gitlab: https://gitlab.gnome.org/GNOME/console
yay -S gnome-console
Gnome Text Editor: https://aur.archlinux.org/packages/gnome-text-editor
Gitlab: https://gitlab.gnome.org/GNOME/gnome-text-editor
yay -S gnome-text-editor