> Unplug the TV from ethernet and disable wifi
This likely requires opening the case and physically disabling (hence knowing what you are doing). Or the TV will find other devices to transmit the data. Not an easy measure for everyone.
a TV cannot "find" a way onto the internet without your wifi password (don't say insecure wireless networks)
a TV cannot "find" a way onto the internet without your wifi password (don't say insecure wireless networks)