Unless you are a Nielsen family , does not matter what you watch as per tvgrimreaper
Not so.
The big cable companies (AT&T, Spectrum, etc.) pull their own data from the boxes/cards. Then, there are new technologies like Symphony. And more direct competitors like Rentrak and Comscore.
I've not heard of tvgrimreaper, but if that's what they say, they're still living in the 1980s.