In the spirit of not being tracked by someone like Facebook, he means that he doesn't want to be identified by an email and therefore have a possible profile built on him based on what he subscribes, reads, saves, etc.
That's definitely fair, but like the OP is saying, how is that the entire point of using RSS? RSS itself stands for Really Simple Syndication, there's nothing saying that clients can't provide extra convenience and features behind a login/profile. I don't think people use RSS feeds to have more privacy.
I completely agree, which is why I will never use any kind of RSS reader "service".
Instead I use Newsbeuter[1], a great standalone RSS client. It runs completely on my own machine. I don't have to give out my email address to anyone else nor do I have to tell the owners of any service what I read or what my interests are. That's completely my own business.
