I'm not sure if it bypasses shields, since it says 'suffers critical damage' I would think that would mean you deal a critical effect card. This might be a card that needs some clarification from FFG, maybe they can address it in an upcoming interview. You know because if it affects ships that ships that still have shields it is a good deal better/different that an ability that only comes into effect when the ship is stripped of shields and you are required to get a Critical hit on it, though there are plenty of cards to help get one.
Edited by Animewarsdude