Sure don't look like 500 yards to me.
It sure does to me. That target looks awfully small.
Using the telephone poles as a measure only works if you know how tall they are to begin with. Any pole that is non standard will throw the calculation off.
A better measure is to look at the tire tracks close to the camera . How wide is a pick-up track? How wide is a tire? Notice how they go over a small rise and disappear. Imagine a pick-up truck sitting in those tracks. How tall would it be? Then take a look again at the closest pole. It's pretty far.