A thing to consider is the average means there are tons of older cars in the mix, but some new ones slowly creeping in. There are lots of cars from the 90s or even 80s driving around where I'm from. Weather can be quite unforgiving for cars here, temperature ranging from -25C(-13F) to +30C(86F) year round. Lots of salt and some types of pavement seem to be exceptionally bad for timing gears[0]. Owning a car is likely the most expensive thing a normal person can do in Finland.
I think it's fair to say, based on your own link which is about research into why timing belts are not lasting as long as everywhere else (a third to half the time!), some of this is outlier. And they note that this dust would also abnormally wear brakes, anything rotating, and the car's painted surfaces, which EVs also have.
But for the rest of it, like temperature differences...this is still going to be a major impact on EVs, and like ICE cars, it won't be just the engine you have to worry about.
As I noted upthread, Tesla has the same powertrain warranty that, say, Kia has. It isn't much of a testament to the vaunted EV reliability that the most famous EV manufacturer doesn't have more faith in their electric powertrains than Kia does in their ICE powertrains.
[0] https://yle.fi/uutiset/74-20000198