Could be an LHD/LPH if the starboard structure amidships is an island, and if the port, aft quarter indentation is an elevator.
Yeah how did people miss it. You'd figure better pics would've surfaced.
That is what in Jiangnan-your guess is as good as mine
Another possiblility for these pictures is that this is a cross sectional major structural support, with the hanger deck being the cutout through it, and the flat top above being the flight deck.Now these looks more like a construction of a large cargo ship. The mysterious picture shows a more completed flat top and island.