Well, certainly ENSO events have always been more and less coupled with the atmosphere, which the MEI attempts to quantify. It was always apparent that this particular cool ENSO event was very well coupled, as opposed to least year's event. I buy into what you are saying to a degree, but you do seem to kind of find a way to attribute everything to the HC. For instance, last year the la nina didn't act like a la nina because the HC nullifies ENSO...but this year, its constructively interfering with ENSO. Just seems a bit nebulous and perhaps overstated to me.
Not trying to be a dick...I get that this is a novel concept.