Most likely, although he was acquitted in absentia of treason in 1999.
In any case, to wrench things back on topic somewhat, Pacepa is in no position to know about al Qaeda anyway - OBL was what, twelve, when Pacepa defected? AQ simply didn't exist back then. Besides, the idea seems rather implausible on its face. On the other hand, I find the suggestion that the PLO was aided by the KGB to be somewhat more plausible.
Oh I have little doubt that the KGB had a lot to do with the PLO, who were socialists first and foremost. But it sickens me how many people lionize that piece of shiete without considering how many lives he destroyed.