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".)
Sorry; I'm kind of new to Lemmy in general — e.g. I'm not sure what my exact post-count & comment-count were before today, but probably both of them were in the single-digits — so I'm not sure what users' etiquette/expectations for frequency of posts are.
(Also, the first several links I posted here today were all about the same band, and it seemed like maybe those got downvoted for that reason; I regret that now, and so I'll avoid posting several about the same band all in a row like that in the future.)