I agree that I misquoted you, but that's a distinction without a difference in this context. "SIM card and baseband radio inside" means 5G, 4G, 3G, whatever. I still demand that you produce proof that there are TVs with "SIM card and baseband radio inside".

I was curious so I did some research. These devices do seem to be being produced, currently mostly overseas. The inclusion of 5G support does not seem to be hidden or nefarious. They provide a SIM card slot just like your phone would. Some models are incorporating a built-in router to provide connectivity to other devices. It seems like the cellular companies are promoting these TV's too, with built in service.

My opinion is this is just a consolidation of devices. I have many friends who live off their phone data plan giving hotspot to the TV and other devices. Now being moved into a common device format, the TV. I don't think they can spy any more effectively this way. Eexcept via the router integration that gives them way more access, but I'm sure this exists already as a wifi feature on tvs. Just technology trudging along. Perhaps they have a secret sim card or esim embedded, that might be a risk as the hardware is already there for a valid reason.