The article puts it this way: "ESV found a Megapack cooling system leak caused a short circuit resulting in overheating that led to a fire in a nearby battery c

The article puts it this way: "ESV found a Megapack cooling system leak caused a short circuit resulting in overheating that led to a fire in a nearby battery compartment." Nothing here implies that the damaging heat generation occurred at the location of the short circuit. It could have been at any point in the new current path created by the short circuit, depending on its resistance and the share of the overload current it carried.