didn't have a single word of condemnation for the perpetrators of the paris attack
A fair criticism. However, would a one-line about condemning the attacks change anything about how you view the content of this speech, the man himself, or the form of government he oversees? For me, no. He has many good points in this speech, and I agree with everything he says. But he's still the leader of a totalitarian theocracy with a deplorable human rights record; condemning the Hebdo attacks directly (as opposed to indirectly, as we know Iran does) wouldn't affect that.
The letter was written back in January. If it condemned the Paris attack that would be pretty impressive.
He did condemn the attacks when they actually happened though. It was even in the New York Times