At the start of the show, an airplane lands and stops near the vehicle, and two passengers disembark. As they exit the just-landed plane, the wheel of the plane clearly has a wheel block in place.
Seth Tyson says that the position of the river was back at a line of stakes 10 or 15 years previously. But the area between the new riverbank and those stakes is populated with trees that are clearly much older than 15 years.
When the developers tell Judy that her property is at the stakes instead of the river, she seems surprised. Matt tells her that he tried to explain that to her over the phone but she wouldn't listen. Why he didn't try to explain it to her again during the car trip from the airport to the river isn't disclosed.