FWIW, NPR's Morning Edition had a segment on the al-Qaeda magazine this morning. They said the magazine wasn't performing as well as previous a-Q publications and that it was met with apathy by their target audience. The magazine is published in English and is said to have a very "American" feel, specially in its use of popular colloquialism and casual speech (e.g. an article titled "Make a bomb in the kitchen of your mom".)
Intel is still investigating its authorship, but given that small sample above, methinks "Dr. Seuss" comes to mind,