I thought only Battery Electric vehicles burst into flames . . .
You house will catch fire if the electrical system is improperly designed. If this vehicle was properly fused it would not catch fire even if water got onto some circuit board because its enclosure is improperly designed.
In the case of EV batteries there is no better design available. And the fires they produce are far more intense and difficult to put out. And causing major environmental damage as 30,000 gallons of chemically polluted water seeps into the ground.