Guess what, the smart TV will stream 4k, and the app allows you to display the current bitrate and resolution to verify it (complaint in the article).
When you're done consuming online stuff on your TV, why not just cut the power? Or hook it up via ethernet to a port you can easily disable? Or both?
Sure, these types of articles can be interesting but this comes off as navel gazing and unnecessary complexity of what the actual issue is.
Agreed on the smart TV - better to assume your home network is already compromised, plan accordingly.