A fairer comparison would be against ICE vehicles of similar average age, price, etc. as Teslas.
The average age of cars on the road (in the U.S.) is 12.5 years. Tesla didn't even sell its first Model S until about 11 years ago and the company didn't start to reach notable volume (over 100,000 in annual U.S. sales) until about 5-6 years ago.
It's misleading, and therefore pretty much useless, to compare car fire data between ICE vehicles and Teslas when ICE vehicles are much older on average, lower priced, etc. Similar can be said about comparing ICE vehicles and EVs in general.