At the minimum, to show that Android is not a locked down walled-garden of a system and you're free to choose what you can do with it to the point you can install a different OS on it?
You can already run Linux apps using Termux and Termux-X11, and I'd say the performance would be better than this demo, because this is running in a virtual machine and uses it's own kernel, whereas with Termux you're running your apps directly on top of the Android Linux kernel. Also, you don't have the overhead of running ChromeOS on top of Android.