whats funny is if a player was able to do what the ai does on this one piece of code they would be banned from the game for cheating.
True. And if they were caught firing all of the ai controlled fleet aaa, I would expect them to be.

why does every other single bullet and round in this game go through such agonizing balistic modelling while this one is allowed to persist without having to do the legwork of every other gun in the game?
I would venture (as someone who has no coding experience in this game or any other) that it's because we're
not talking about one bullet, one shell, one puffy burst.