@bart Some notes: firstly a while ago I spoke to the Plasma Mobile team and there was not a consensus on whether Plasma Mobile was a distribution; some thought it was, others thought it wasn't. That may have changed. Secondly, I wouldn't describe "phosh" as a desktop environment; it's just a shell in the same way that GNOME Shell is just a shell and the DE is actually GNOME. Lastly, Nemo Mobile, as a distribution, stopped functioning a long time ago. The last Nemo image was released in 2014.
@rah Plasma Mobile is definitely just a DE with the distribution people are referring to being KDE Neon. No doubt about it, and the Plasma Mobile team agrees with this afaik. The main dev (Bhushan Shah) read my blog post and didn't mention it being wrong.
As for Phosh, I guess you're right. The difference between shell and DE isn't that big though imo.
Nemo Mobile as a distribution is still alive, although agreed it hasn't had new images in a long time. Their IRC/Matrix is still active though!