[strkek]

I think it's a situation sort of like with SSL and TLS, where the former term implies the latter. I mean, it's not rare to find people using the term "SSL Certificates" even on TLS-only setups. Also:

https://wiki.openssl.org/index.php/Libssl_API

> libssl is the portion of OpenSSL which supports TLS

It's for TLS support yet they call it "libssl".

So yeah, you can just mentally replace "RSS" with "RSS/Atom" and most of the time it'll be fine.