Samsung Smart TVs do not take screenshots as far as I know. They do audio and video fingerprinting. It would be way too costly and inificient to upload screenshots for content recognition (https://en.m.wikipedia.org/wiki/Automatic_content_recognitio...).
Disclaimer: I work for Samsung, but not directly in the TV software.
So, they do video fingerprinting?
To me, that means that they can identify what you
are watching, which I think is what the OP was
pointing out, regardless of mechanism.
Mike (ex-CTO Shazam)