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I am not an expert.
The guy in the video explained that the bar in the collapsed school was not rusted. The concrete had weakened or it was placed too close to the edge. This resulted in the bar being bent over at the ends. It seems the concrete is prone to failure in a few different ways. All of which stem from water damage from leaking above.
Sorry but that is not the interpretation I got.
The rusting of the rebar causes expansion. Because aac has the air to absorbed that expansion. The rebar done not have the compressive protection of the concrete to prevent the bend. With non aerated concrete. When this happens it is obvious as the concrete collapses rather then moves aside.
The lack of compressive resistance above the rebar is what allowed it to bent.