Everybody getting very hung up on the cladding, but there is vastly more to how the fire spread than this; the cladding appears to have been the obvious means for the fire to travel up the facade, but if the building is properly compartmented as it ought to be, then that shouldn't matter too much. Each flat ought to be giving at least an hour fire resistance, each flat should be containing any fire within; the fire tore through the entire building, so there are serious questions about the fire stops and fire breaks in the main structure and the cladding, the non existent fire alarm, the extract ventilation, the number of escape stairs and capacity, the 'stay in your flat' advice, the potential ruptured gas main in an escape stairwell etc etc...
Just having this type of cladding does not instantly mean a building is a deathtrap,there are many other factors at play here.