Ever since the ill fated Comet series early on, virtually every commercial passenger airplane has been designed with multiple crack stoppers, redundant load paths, etc. IOW the plane does NOT disintegrate like a punctured balloon simply due to overpressure
Looking at the crack protuding more than one frame forward, this might have already been far beyond the required damage tolerance capability and that crack my have grown up to the door if the fuselage would have been fully pressurized...
Crack stoppers are required to stop a two bay crack (one frame/one stringer lost, two skin panels cracked). Initial damage beyond this might indeed cause full desintegration.