Sulfate does not accentuate hops. It drys the beer's finish which can allow hopping and bittering to be more prominent in the flavor. If neither of those elements are really present in the recipe, the sulfate won't add them. Some sulfate in beers is helpful in clearing the palate and making the beer more drinkable.
The definition of accentuating is to make more prominent so we are saying the same thing. You said sulfate drys out the beer which makes the hop flavor more prominent. Wouldn't that be the same as sulfate accentuates the hop flavor?
I said sulfate aids in the accentuation of hops meaning adding sulfate to a hopped beer would make the hop flavor more prominent (by drying out the beer). For sulfate to be able to aid in the accentuation of hops, hops already need to be in the beer. If hops aren't in the beer, there is nothing for sulfate to aid. Maybe my wording should have been clearer.
I probably should have said, adding gypsum (sulfate) to a hopped beer will help bring out the hop flavor.