I dunno, this seems to fall under the category of "directly contradictory FAQ statements"
Not in the slightest. What issue do you see?
Moreover, this may be more generally clarifying that if you have a total of 10 launch bays, you can launch 10 ACs from the same ship (over several turns), rather than having to launch from each different ship.
This is literally what the FAQ is saying, and supports Option B.
It also makes it functionally similar to pre-FAQ. Before, that Emperor could keep pouring out the Assault Boats. Now, it can only pour out as many Assault Boats as there are hangars in the fleet.
The hangar number is simply an arbitrary limit on the number of AC on the table due to previous player whining, and explicitly
not a limit to any specific ship. If you need a fluff justification, perhaps all the carriers are coordinating the attack, providing data, etc. Thus, they keep their wings unlaunched and instead help the flagship direct the massive waves.
To me, intent and RAW are perfectly clear and point to Option B *shrug*
The whole Dark Eldar thing shouldn't apply here either, because it's an entirely different and special kind of AC.