That quote is meant to be taken figuratively.

Propaganda in the loosest definition just means reporting in a biased manner to push a political agenda. You can be 100% accurate with what you say and it still can be considered propaganda due to the manner in which it is presented.

While WP or VoA, in contrast to RT, don't outright lie or deceptively create fake stories, they do have a pro-USA bias. That's why it's a hyperbolic statement. It was just meant to elaborate on the distrust for the article.