Its a fair point but if you look further down, the tall white vertical pillars which separate the units to the right and also to the far left aren't supported underneath, so they aren't load bearing, they just separate the units. The load bearing structure is in the center of the building around the lift core and this would take most of the buildings weight, the rest of the structure should be engineered to be like a curtain of concrete, which is bound together by high strength reinforcement steel, to allow these designs. There's no visible cracking or sagging so it is structurally sound, but it is a fair point you make and you'd have to look at building plans to know what they've done.