There are so many factors to take into consideration that the argument would be a book to get a full view...
For example, if you want to move past generalizations (such as the author of the blog post made) you would also have to consider things such as the type of people using the cars vs other premium vehicles. Likely Tesla users are going to be more apt to try more things, which in turn makes them at a higher risk to drive erratically or at higher speeds (even perhaps higher than other premium vehicle users).
Further, I would suspect premium vehicles have a higher rate of deaths due to accident than the average population of car. However, that data might not be available to him.
For example, if you want to move past generalizations (such as the author of the blog post made) you would also have to consider things such as the type of people using the cars vs other premium vehicles. Likely Tesla users are going to be more apt to try more things, which in turn makes them at a higher risk to drive erratically or at higher speeds (even perhaps higher than other premium vehicle users).
Further, I would suspect premium vehicles have a higher rate of deaths due to accident than the average population of car. However, that data might not be available to him.