Not if you look at the rate of change as well as the change. If it’s trending towards zero, it can be a curve rather than straight line. That can then trend negative.
Think of a car going fast, then applying the brakes. It slows down until it eventually stops.
Now think of a boat. It doesn’t have a brake. It has a reverse throttle. When you want to slow down, the motor goes backwards. When you hit zero, you start to then go backwards. That’s what they are extrapolating.