Yeah but if I were to meet someone new in person, I'd tell them my name. If I meet someone new on the internet where I have a handle, I wouldn't want the company of the site I am using to actually know my real name. That doesn't make my name a secret, more something private to me and those I choose to share it with. If a website then correlates my handle to my other behavior on the internet and finds say my name via Amazon shipping info or whatever, then that's a violation of my privacy, not secrecy.
Maybe a name isn't the best example, idk, but there's an apparent distinction between something secret or private imo.
My name is not secret, lots of people know my name. My name is private, I want to share it with the people I want to share it with, not with everyone on the internet/every corporation I interact with.
I think that's why data collection falls under the 'privacy' instead of 'secrecy' category for the most part.