"Yet the article is rife with obviously reckless and unproven allegations, and fundamentally shaped by shoddy, slothful journalistic tactics. It was not surprising to learn that, as BuzzFeed’s Sheera Frenkel noted, “a lot of reporters passed on this story.” Its huge flaws are self-evident. But the Post gleefully ran with it and then promoted it aggressively, led by its Executive Editor Marty Baron:"

This is a very overt and obvious example of mainstream media publications uncritically publishing what essentially amounts to fake news, which is then picked up and repeated by "journalists" from other mainstream publications, thus entering the "news cycle."  Once this "news" enters the cycle, by your logic, it becomes more accurate because "credible" publications have published it.

It's only when real journalists such as Greenwald look at the "evidence" itself that we discover the truth.  Your version of "truth" simply means a real journalists hasn't exposed it yet.