Somebody would have to actively watch you. And properly setup it would still be more private.
You follow a bunch of political sites. Your FBI agent sees your computer connect to the sites. With regular browser he sees each site and how much time you spend there, which articles you pull.
With RSS set to once a day, your computer pulls all the text from all the political sites. No data on which articles you view.
It’s the equivalent of getting several newspapers/magazines by subscription vs ordering specific issues.
The downside is that it probably is a great fingerprint if you go through vpn or tor. But it also could limit your tor/vpn connection time to the shortest time possible.
Adversary just has to look for somebody who requests the exact same news sources.
RSS in theory would be fucking perfect for tor. But all the best development for it occurred before tor got great.
For privacy have a client download from random news sources on the list. Then a new circuit and download another random amount. That would be a perfect way to receive news.