While this is certainly possible I think it is more likely the case that the Islamics in China got a hold of these weapons through rogue Chinese elements and sold them to Al Qaeda.
No, what happened is that China sells ammo to absolutely anyone, anywhere. The US is full of private citizens with basements full of Chinese ammo; so are Pakistani arms markets. And dozens upon dozens of countries have SA-7s. You don't need to spefically be given this stuff by the PRC to get it.
Gertz is revealed as a DEBKA-spouting complete moron in this article and it's an embarassment for Drudge that this is his headline, and an embarassment for FR that so many people are unquestioningly accepting the article.