Naval Superiority is a plot card that reads:
Raise the claim value on your revealed plot card by 2 during challenges in which you have declared a [Naval] attacker.
I want to know if the claim remains raised even if all the characters that were declared as Naval attackers end up removed from the challenge. It doesn't say "had Naval attacker" like the Black Sails agenda does, but "have declared", so I have some doubts.