Very unlikely based on his previous work.
I give you two clues in support of my post:
(1) "Murray draws heavily from social-science data—described in multiple appendices that span nearly 100 pages" [note: text marking is my own] -- http://www.thedailybeast.com/articles/2012/02/08/charles-murray-s-coming-apart-and-the-culture-myth.html
(2) Murray doesn't summarize his statistics in the article -- his summarizes his wishful conclusions in prejudicial, simplistic roll-ups and cartoon-like examples.
Not having the time to pursue this further, I'd bet he mischaracterized the very statistical data he references in that fulsome appendix.