I hope there’s some way to blast it with localized radio noise to block the 5G for just that purpose.

Really just need to make the dark patterns illegal or costly though.

Jamming is usually illegal, probably even in your home. For good reason: it's unlikely you can prevent the effect of the jammer from leaking outside.

But shielding is just fine and is mentioned elsewhere in this thread.

But hopefully less than a whole room of shielding.

Disconnect, cut, or desolder the antenna.

They probably use different antennas though so you could cut the cellular modems antenna connection without impacting the remotes.

Different antenna?

Smartphones only have one antenna as far as I know. Why should it be different for TVs?

The Xbox One S for example has two separate Mediatek radios. One for networking the other for the controller.

There's another option: Buy and hook up a dumb hdmi converter to the panel. Taobao has these (low latency, niche gamer market)

The Xbox is doing it that way because they need the lowest input latency possible for the controllers. Blocking the antenna for network operations delays the user input. A TV doesn't have that problem and certainly won't have two antennas.

We are effectively helpless against those tinier and tinier SoCs and the only option is not to buy.

Smartphones typically have four (or more) antennas. 2 for cell (main and diversity), one for wifi/bluetooth, one for GPS. Some phones compress that down to 2, but lose signal strength by doing so.