Huh.
It's a good thing my assignors aren't grumpy.
Actually, if I would've called it like you wanted, A would've won by 3, or possibly 5. If we tell B's coach we screwed up, but still get to leave the basket on the board, and charge him for his (probably) last TO, he's probably going to be getting a T. And, depending on their personality, maybe 2. So Grumpy Ol' Assignor will still have to write a bunch of letters.
I think we all agree we just can't go back and retroactively call fouls and violations. And we all agree about the correctable error situations. But where we disagree is whether this is retroactively calling a violation, or correcting a wrong rule interpretation.
So, I'm done. I've got to go put an ice pack on my wrist.