Is this because of the xz utils thing? The backdoor was included into the tarball, but it wasn't in the git repo.
By switching away from tarballs they pribably hope to prevent that, although this article doesn't mention that. It's possible this shift has been happening since before the xz utils.
Although the usage of (x)wayland is novel, there have already beem projects which do something similar before.
Termux can run a linux container in a proot, which you can then connect to via an app like vnc to get graphics.
There exist several options to automate this setup, such as anlinux. There is also the proprietary andronix, which used to be open source but now it looks like tgere repos aren't being updated.
It's bad reporting to frame this as a novel app, when it's not. The novel thing is the way this app does xwayland rendered by a native wayland compositor (instead of remote desktop softeare or other solutions), which is really cool though.