Anyone who ever uses the term "media literacy" is just a shill for legacy media.
"Do you have a reliable source?" basically just means that they want you to have an "approved" news organization as a source.
I recall a Zerohedge article that laid out all the sources of information directly on the Rolling Stone Ivermectin/gunshot wounds in Oklahoma story being bullshit, but to a libshit this still was not good enough because it was not from a "reliable source."