Internally, PSA probably has a grading "4SC" code to flag orders that they automatically bump up the majority of grades in the Q/A stage, most commonly referred to as the "Four Sharp Corners Treatment."
So for you review, Nat probably just emailed a PSA customer rep and said, "Hey Ryan, give this guy the 'Four Sharp Corners Treatment' for order Number #128872."
Ryan then replied, "I'm on it, chief." knowing
exactly what that meant.
At least, that's what the true cynic in me thinks of when I read how your order and subsequent "review" went down.