Reading the actual article, it appears that Black September was targeting the crew and their families, rather than the rocket stack.
Of course, that isn't the hypothetical that PE was posing. Which isn't to say they wouldn't have blown up the rocket - which would have made for one hell of an explosion - if they really had a chance.
Of course, that isn't the hypothetical that PE was posing. Which isn't to say they wouldn't have blown up the rocket - which would have made for one hell of an explosion - if they really had a chance.