I think it is just a desktop environment for linux. So it probably wont work on TVs by themselves.
EDIT:
Reading the article now, and I can see why you thought that. I was getting ready to eat my words.
it aimed to turn regular television sets into smart, Linux-powered devices
But on the project page it says:
Plasma Bigscreen is a user-friendly, open-source interface designed for devices like HTPCs and SBCs connected to TVs and projectors. It provides an intuitive experience that allows for easy navigation from a distance using remote controls. Discover an engaging environment that adapts to your preferences, offering the safety and privacy protection that come with the Free and Open Source Software.