Like the frog and the scorpion fable
Lawyers can't help it. It's just the way they are.
From a legal standpoint he is probably correct. The statements were not under oath and UBL could claim that he was lying. As to the motive for lying to "the brothers". He might say that they all knew that it was a martyr's mission and witholding the details was for security reasons.
A good defense lawyer can shape the truth anyway he chooses. What he can't control (legally) is the jury. There is no way he could get a judicial dismissal and there no randomly picked jury in this country that would not convict. He has acknowledged this.