The Skeptic Magazine article was from the November/December 2006 issue, and publication preceded the date of publication of Debunking 9/11 Debunking.
The Popular Mechanics nonsense was under attack for a long time, however, before the release of the Griffin Debunking 9/11 Debunking book. Immediately upon publication of their first article, rebuttals appeared, most notably Jim Hoffman's:
Popular Mechanics Attacks its '9/11 Lies' Straw Man
Updated versions appeared in 2005 (more than a year and a half before the Skeptic article):
Popular Mechanics' Deceptive Smear Against 9/11 Truth
David Ray Griffin directly addressed Popular Mechanics several times:
9/11 and the American Empire by David Ray Griffin
The Destruction of the World Trade Center:
Why the Official Account Cannot Be True
Of special interest here is a link between Hearst Corporation CEO Victor F. Ganzi and the one and only C.I.A.:
More 2005 work in response to the Popular Mechanics lies:
Alex Jones Responds To Ben Chertoff, Popular Mechanics 9/11 Debunking Campaign
Griffin's August 2006 CBC News interview should have been a tip off to Skeptic Rag as well:
"Well, [Popular Mechanics' Book] is one of the most disgraceful publications that has ever appeared, and as I’ve said in my new book, the Popular Mechanics owes the American public for putting this out – it is simply a disgrace."