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"As my structural design professor always said : It is impossible to design a plane that can not be destroyed by wrong pilot control inputs at the right speed and flight attitude. (might not be true for fighter airplane where the physical capabilities of the pilot are the limiting factor and the pilot rather kills himself before breaking the airframe)"
He said "right speed and flight attitude" This airplane was way below it's design maximum speed. And was not at an attitude that was out of cert limits. Of course if you dive to mach 1 and pull back hard at step on one rudder pedal hard the wings and tail will come off. I been in flutter tests as well.