"Plasma" is an awkward name for a television app. First image that comes to mind is the old plasma 50-inch I used to have. Damn thing weighed nearly 100 pounds and was really power-hungry.
Bought it as an intern dirt cheap off of some dude at my company who posted it in a email group. He upgraded to the latest and greatest and just wanted it hauled out. Picture quality (for the time) was incredible!
It also doubled as the worlds best space heater. My god it was power hungry.
“Plasma” just refers to the desktop environment: https://kde.org/plasma-desktop/
So this is a “Big Screen” UI for KDE Plasma.