The Science paper I linked was meant to show that the twitter graph has properties which spread fake news through its part of the news propagation graph. The people I referenced were meant to show that people on the graph with such a property are talking about the fake news problem as if it is real. Taken together, my response to you was trying to get at the idea that fake news, even if not a thing from the perspective of one node on overall news propagation graph, can seem very real from another position on the graph.

So basically, I disagree with the claim that fake news doesn't exist, in a subtle way.