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You are the GM
You say what goes
He is a player
He is responsible for rolling and upkeeping his character including rolls, ranks, feats and math.
If a game is played and events takes place based on actions by the players, then it happens.
Make a general ruling.
If there is a mistake by a player, it needs to be corrected and brought up within the same game session.
Give too much time and players will have too much time to think up a good excuse or reason.
You are the GM, it is your game.
At any time, the player could have re-checked his dex and bonuses during the event. I re-check to make sure if I am going to be suffering massive damage.
Seems this player did not do so and accepted it.
Unfairness is showing favoritism
Unfairness is giving no chance for any player to make his appeal.
This player is just mad that she did not spot the error in time
Now he is whining about his screw up by blaming other instead of his calculator.
Once you give chances to people like him, he will continue to do it again seeing that you can be pushed that far to give.
Others may follow his example.
So do a general ruling of appeals in same game session, stats and actions are on the player's responsibility not yours.