Yes, that is over an about 20 years lifetime of the car.
There are 175,000 car fires in the US out of 280 million registered vehicles or about 0.0625%.
I think a big difference here is the way cars burn. Most petrol cars catch fire after an impact accident.
You can take good care of your EV, wax it every month, drive it like your grandmother would and as a thanks, it will spontaneous combust in the middle of the night.