The point is the battery burned hot enough long enough to melt aluminum. Some of the aluminum likely burned, which is just more fuel on that fire.
There's enough energy in a typical tank of gasoline to melt all of the steel in the car it comes in, so that's not especially alarming. Of course, in the typical ICE gas fire, a large amount of the heat from the burning gasoline doesn't end up going into the car body itself, but into the air in various ways. Not to mention that the steel is usually more likely to burn than to melt. In burning, fiery wreck terms I would say that EV is generally a better bet than ICE.
Of course, you can practically ship an ICE with no gas in the tank. Obviously not so easy for an EV. The really interesting question here is more a question of how the fire started. Was it a spontaneously combusting EV or EV battery, or did the fire start some other way and just spread to the EVs? It's possible we'll find out, but probably only if they had good video surveillance.