I kind of like the other conclusion: Impact Factor of the journal is not associates with the number of citations. IF is an important point in this bussiness. I've been in some job screening in which they aggregate your papers according to the IF of the journals (like one paper in a 1st quartile journal equals three papers of a 2nd quartile).
But according to this data you could publish in a 4th quartile that if your paper is interesting, free to download and with some figures, it will be read and cited.
The more downloads leads to more citations(so the paper is seen by more people).
or
The more interesting papers has more downloads(people download papers that are more interesting).
Looks like both way makes sense. Not sure which way is contributed more to the correlation?