How would you know that this article is itself not fake? In this case, disclaimers have been placed on the original article, but that doesn't usually happen.

This is the problem with confirmation bias. What if another article came out to reveal that this article was fake? And then recursively on and on. How would you know how to distinguish the reality? I sense most people will believe what they want to believe, and if that be the original article (possibly fake), or the rebuttal article (possibly fake). We have to go entirely on our ability to trust the source.