This is a live-in-the-studio version of a song from this band's debut LP โ IMO, the best one from that album โ which was released in 2016. It's basically early-1970s style retro hard rock, similar to Mountain, Black Sabbath's early albums, Nektar's early albums, Atomic Rooster's second album, Budgie, etc.
Well, although usually it's a good idea to read the original post first, in this instance the original post is at best misleading because it refers to Plasma as an "operating system" rather than a desktop environment.
(Or for those who want to use even more precise terminology: its full name is either "Plasma Desktop" or "KDE Plasma Desktop", because KDE also has some non-desktop environments such as Plasma Mobile and Plasma Bigscreen... none of which are as popular as Plasma Desktop, though, so usually Plasma Desktop is colloquially called just "Plasma".)