Long story short: In 2018 was revealed that most of his articles were fake or embellished. He got away with it for so long because everyone _wanted_ the world to be the way he portrayed it, almost nobody looked closer.
I think this is symptomatic of modern journalism: Many journalists are only interested in getting recognition in their circles, so they do whatever is necessary to get it, even if it means bending facts. This is also problematic because it casts a bad light on reputable journalists who reflect the events of the "boring" world correctly and not through lies or Hollywood stories.