Two things:

1) What I called "automated content detection" is apparently called "automated content recognition", abbreviated as "ACR".

2) That weeks, months, or years of locally-stored activity I mentioned can also contain historical ACR records. Given that the audio and video of what's being displayed on the screen is "fingerprinted", those fingerprints can be saved just like everything else picked up by the "TV" and uploaded whenever the thing next has Internet connectivity. The "TV" manufacturer will lose the "what are they doing right now?" aspect of the feature, but the "what have they been doing?" aspect of the feature will work just fine.

Directly related is this section of this Gamers Nexus investigation, but the entire video seems to be worth watching if you're not rather familiar with the topic: <https://youtube.com/watch?v=6IFVTcM28KA&t=26m47s>