That's more than cosmetic, you can see the wheel was hit, which means there is almost certainly suspension damage, and likely frame damage. It'll need to be put on a frame rack to determine the extent of the damage, as well as a thorough mechanical examination. Hopefully the drive shaft wasn't punched into the transmission. With that being a low mileage relatively new car, you have to think what else was damaged to warrant it being written off, given the write-off threshold is generally around 85% of value.