Difficult to believe that behaviors such as ENSO and QBO are not related to external forcing. I can't think of one large scale cyclic behavior that can't be pinned to some other regular cycle. Even the cycles of sunspots are known to be intimately tied to the sun's rotation. So even though they haven't quite nailed the predictability of sunspots yet, they know it isn't some spontaneous oscillation as the purveyors of the wind-only mechanism for ENSO seem to think.
Thus, much like sunspots, ENSO is likely sensitive to variations in the Earth's rotation speed. As the moon is known to cause cyclic variations in the speed, these same variations should be able to be picked up in an ENSO wave equation model. And what do we find but that the two most critical lunar periods, the Draconic 27.2122 days and Anomalistic 27.5545 days feed into a best-fit model to within 1 minute each.
Got a reply tweet from Andrew Dessler concerning this and he said *"Climate is a physics problem, not a statistics one. Looking at correlations is interesting, but not sufficient. Must have physical basis."*
Some of these guys do not realize that science deals with this situation automatically. They should be able to eventually reject the lunar forcing by coming up with evidence that rejects it. It shouldn't be hard, as all they have to do is show that the ENSO cycles are incommensurate with the lunar cycles. And show how there is not enough energy supplied by the lunisolar cycles to move volumes of water in a reduced effective gravity environment. If they can't, however, then the lunar model will remain as a potential ENSO driver.