I think Mir should be looked at as an independent project now. I might be wrong, of course, but that's the impression I have.
https://github.com/MirServer/mir/commits?author=gerboland https://launchpad.net/~gerboland https://www.phoronix.com/scan.php?page=news_item&px=Mir-Now-...
I won't argue with that :-P
That said, if the guy who posted this is not employed by Canonical (like I speculated), and has _never_ been employed by Canonical, I would like to further speculate that either (a) he's doing this in order to specifically gain favor with Canonical employees and increase his chances of employment there later, or (b) to increase his chances of employment at any of the "big Linux players", or (c) to increase his knowledge of the X/wayland ecosystem and C coding in general.
All of which sound like good investments on his part.
Anyway that's speculation upon speculation, obviously, but if I was a professor at a generic I.T. bachelor/masters, this is exactly what I'd tell my students to do in their spare time (and if they could weave it into related classwork, all the better obviously).