If it is internet-connected without the Apple TV, it's likely taking screen captures an identifying what you're watching.
This kind of behavior seems entirely anti-consumer. There should be legislation that limits how much literal wattage can be used of a consumer’s device that does not serve the purpose of the consumption and benefits the company financially.
Why do you assume that would that stop it spying?
Likely because they took away the internet connection from the TV and got their smart features from the box.