According to the evaluation report[1], the fire started after the car was started, while stationary. So I think it's unfair to call it "while parked".
However the report also mentions in section 4.1 a study which concluded there's no noticeable difference in the chance of catching fire and the severity of the fire between ICE vehicles and electric vehicles.
And in 4.2 they say that in this fire there was not any noticeable difference between the two types of cars. No any evidence was found to suggest that any of the EVs experienced thermal runaway.
Extinguishing EV fire is not hard, you just just need a lot of water. The problem is that it will re-ignite after a while. So you can't just leave it after that, you need to move the wreck to a safe location and have some firefighters wait until if reignites, drown it in water and repeat.. The alternative is to drop the car in a container of water, but has it's own drawbacks.
It really depends on what kind of risks we willing to accept. Since people sleep well in homes with pipelines of explosive gas
