This article is a perfect example of the incredibly sloppy and biased thinking that happens in media and which is part of the very problem it talks about. Fake news first and formost is a clickbait scam to get advertising dollars, NOT a political propaganda approach and this tendency to keep using it as if it's an actual political issue is really absurd and itself an example of what is probably more an example of slo…
My own pet hypothesis for the larger phenomenon discussed here is this: Younger generations had schooling that attempted to make them "college ready" and part of that college readiness was understanding how to find and cite credible sources, alongside understanding what a "primary source" is. Sure, it didn't stick with everyone, but I do think bits-and-pieces of that are imprinted on Millennials.
Along with that you have many younger people doing white collar "knowledge work" which often involves compiling and synthesizing information from multiple sources and drawing a conclusion. This understanding of "how the sausage is made" carries into media literacy when say, examining an editorial for factual accuracy.