I have to stick up for my man crush here, I think some of this stuff is more sophisticated than the norm:
He isnt just debating 'do we go under the screen or blitz it or fight through it', its much more detailed than that because he is looking at such a small subset. "Side pick and rolls against smalls, there are 3 actions, and there are choices to defend each of those actions" and thats where the advanced stuff comes in. Thats where the advanced numbers come in and make simple defense much more intelligent.
The strategy turns into 'When Deron Williams runs a pick and roll with Paul Pierce, do not leave KG open because he is a good shooter. Paul is a good slasher and popper from the top of the key but not from the side anymore, he also isnt a great spot up shooter. So we will blitz the pick and roll because we can temporarily leave Pierce as long as we dont give him enough time to spot up for the 3. This is our best option because when Deron runs a pick and roll and ends up being guarded by a 3 their point per shot for those possessions is 1.1 vs 1.02 when he is blitzed'
Yes this is conjecture on my part but its based on info like this:
My take is that as the notes track all the individual options during a play, and then within those options he dissects the subsets and analyzes the subsets to build the best strategy for each of them. So he isnt deciding 'lets blitz the p&r against the Nets', its 'lets blitz the screen when run by these 2 players with player x at the 4', 'lets go under the screen when run by these 2 players with player z at the 4'
Here is a different example
from the tourney against Bucknell, where they threw a defense that they almost never run at Stevens, and he knew exactly how many times they ran it and what their defensive call was for it.