Could be, but then the listing is in error when stating "external fire". When I rebuilt an external fire S500, the listing stated "engine fire" which was completely wrong.The cowl and bottom part of that windshield were the hottest part of the fire, which is why I suspected wiper motor.
Here is a picture of a like area from the external fire S500 I rebuilt. The damage in the pictures look simular. The S500 was parked in a garage that caught fire, and some of the garage the caught fire dropped on the hood of the car, which resulted in damage to the hood and some of the under the hood areas.