This is very true, but ICE fires are actually a lot more straight forward. Once oxygen is cut off from the flame, it goes in ICE cars. Even the lead acid batteries go out using the same method. This is because unless you have an ignition source there is no reason for any part of your car to catch fire (in modern cars the ignition system shuts off and drains all power in the event of an accident).
BEVs on the other hand can reach auto-ignition, meaning they will ignite themselves... this can obviously be very problematic. I'm sure we have all heard the story about when Richard Hamond crashed the Rimac One and the fire went on for days. This is due to several issues, the first being thermal runaway. Lithium Ion batteries can enter thermal runaway, which is when the battery gets caught in a chemical reaction cycle resulting in it heating up uncontrollably. Once in this state it can't really be stopped. If the manufacturer misprograms certain peramiters, the batteries are punctured, there is a manufacturing error, or the battery in an unsuitable environment, the batteries can enter thermal runaway, even from just charging. The biggest problem with thermal runaway is if the neighboring battery cells enter thermal runaway, the heat, chemicals, and expansion of the original cell almost always triggers its neighboring cells to also go into thermal runaway. This leads to hours upon hours of cells going off like a chain reaction. you would have to isolate the battery from oxygen the entire time and once exposed to oxygen it might trigger a reaction again. This also does not go into the explosive nature of these reactions, the intense heat these fires produce, and the hazardous fumes they give off.
At the end of the day ICE fires are a lot more straight forward and easy to quell. I think electric cars are the future and think that as time goes on technologies like hydrogen could improve them greatly... but there are still many issues with electric vehicles... especially those that run on lithium ion batteries.