All that is true but not on point.
The point is that the CIA acting director was likely correct when he said CIA did not request help from DOD. That was the discussion. He made a point that is probably both correct and CYA
As you noted, he did not need to make the request to DOD
If it’s true then it’s not really a CYA for Petraeus and the CIA it’s just the truth. But the point of anyone making that fact some kind of relevant point is just an attempted CYA for 0coward.