PJ, what do you think that means? All of them purged I mean.
I think we can all speculate on the various reasons for this, ranging from the benign to the ominous:
4chan was founded as an anonymous site for people to share images. I've heard that people also share "fan fiction" over there, where "fiction" (in "scare quotes") is really counter-culture distorted fantasies. It could be true that people were anonymously making up obscene stories about world leaders, just to see who can top whom in thinking up the most outrageous things. It could be true that someone doing candidate opposition research stumbled across this.
It could be true that someone saw this, thought it was real, and started circulating rumors.
It could be true that someone saw this, knew it for what it was, and leveraged it into "foreign intel" for nefarious purposes, putting a plan in place relied on parts of this as "internet corroboration."
It could be true that once the Buzz Feed story exposing this to the general population was out there, the original sources on 4chan were no longer needed.
-PJ