Why do you say that? The fire department is a service hired by us to extinguish our stuff. Didn't they learn how to put out gasoline engine car fires 100 years ago? They should have refused because they only knew how to put out horse fires?
In those 100 years, we've learned a thing or two. Which is why we have fire codes and whatnot. We reduce the variation in the number of expected scenarios.
I'll also note that in general, it is easier to learn something different when it's not similar to what you already know. Horse fire vs car fire is easy. Car type A vs car type B vs car type C is more difficult.
Tesla is actually _really_ good at distributing training materials to emergency responders. All vehicle manufacturers do it some some extent, but Tesla sets a very high bar.
Fire departments had to get special training for the Prius (and other hybrid cars) because of the power cabling going from the rear battery to the front. It's not that unusual.