Is it possible to get this desktop enviroment back?

I was wondering how to get this DE back on qubes, or if its even possible.

I think that’s KDE right? I don’t use it myself but the instructions in the doc page should work, if not please post back here with what went wrong.

It is KDE, and those instructions still work.
The rest is simple customisation, using quick launchers to keep
launchers together, (drag and drop from the KDE menu), some
transparency, etc.
You can get this sort of effect in minutes. Of course, you can spend
hours tweaking.

Besides the nice visual effects, with KDE you get activities and a
customisable menu. There’s a lengthy thread here about using KDE.

I never presume to speak for the Qubes team.
When I comment in the Forum I speak for myself.