She may have inferred "what she had plugged in", and I didn't offhand see the er, non-'connection'--bad dope.

As to my abscence of peeping anything at all of such snoop messages as D. reported, my Arris™ Surfboard modem to cable {ugh-Comcast} may?/must?/may-not have given their addy to my TV--but its use is as a mere TV-receiver; ia port on a sub-box from Comcast sends the RF-signal to TV, a separate multi-pin cable port --> iMac. ie no use of TV as a 'browser' evah.

tl;dr: never received any Vizio Setup message, so if it has Comcast data, it has yet to demonstrate anything: which I see doesn't mean that it doesn't harvest data to a fare-thee-well, but keeps silent.
{{sigh}} Poor Winston Smith--he tried to warn us, but NOOO..