I don’t see how it would possibly be worse than it happening in use V’s. Testing. This is part of why there is testing. Any system a small percentage of components will be out of spec or defective. Or damaged in transit. There are on the order of 1+ million or more individual battery cells in this installation, which means also multiple times that in electrical connections, plus BMS electronics. Assuming it stays isolated to a single unit, and no other fires occur, I would say their system design is excellent.