AQ Khan stared his business before Mush was even the head of the army. In fact it was during PPP and PML rule that most of this went down. Nice try at falsifying facts though.
Musharraf himself may not be directly involved in proliferation of nuclear arms since he came on the scene a bit later, I give you that. Even if AQ Khan is guilty it is just incomprehensible that he could have committed this crime without the full knowledge and involvement of the corrupt generals in the military (going as far back as mard-e-haq Zia-ul-Haq)
So AQ is dead right about being made the scapegoat in this whole saga.