No, termux is not involved at all. This is a terminal included as part of Android. You won't see it until you enable it in the developer settings, then there will be a new app called terminal. Everything is done from there.
Discussion
Got it! That's the info I was missing 👍
That's it! 🚀
Some more helpful info
Graphics acceleration is buggy with gnome & XFCE. I wouldn't enable it if you want to try them. If you want to test it, weston, the reference Wayland compositor is your best choice. It doesn't offer much in the way of a desktop though, just a clock & terminal.