Existing LTE is fine. If they wanted to embed modems in the TVs they could do it now. I'm guessing they simply don't have to, simply because a huge number of consumers will dutifully hand over their Wi-Fi passwords.
While this is certainly possible, I’d imagine this sort of thing would be found quite quickly and would result in a massive lawsuit if not disclosed on the package.
Search for 5g miot or 5g massive iot or maybe even 5g redcap