Not true.
Just think about the electronic logistics of it for a start. How exactly would the TV communicate the information back to wherever it needs to go to be collated ? It would need some form of transmitter to send stuff out, not just receive it. And if TV's had a transmitter of some sort in them, you'd know all about it.
Also - I suspect it would be considered an unnecessary infringment of privacy for people to have their viewing habits recorded, stored and colated withoiut their permission. Wouldn't stand-up to any legal challenge I strongly suspect.