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I'm trying to find more information about these 2 companies fingerprinting or hashing anything coming over HDMI. Do you have sources? I thought disconnecting my smart TV from internet to be enough to stop the transmission of any ACR data. My concern would be if they store any ACR data locally and queue it for data collection vs if they stream it.

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It is in the paper:

"We find that: (1) ACR network traffic exists when watching linear TV and when using smart TV as an external display using HDMI"

But also that they send it in batches every 15 seconds (Samsung) or every minute (LG). The question is whether an offline TV will lie in wait to send all the data it collected in one massive batch, when and if it gets online. That wasn't tested.

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