BigHitDH - with its poor resolution, that photo doesn't contribute to me what you see.
The Galley is installed as a unit (module) at the plant, so its strength is intrinsic, but well short of a/c substructure design. It may well have been robust enough to resist fragmentation while falling (free, on its own), but probably not strong enough to resist high speed air mass. If a/c underwent some sort of structural compromise of the pressure hull, doesn't mean it didn't remain substantially complete to enter the water at a velocity much lower than that experienced at cruise.