I have found that more times than not a moving decoy is not necessarily a good thing for coyotes. They will either shy away from it or charge hard and fast, leaving no good opportunity for a shot. I think the exception is a stationary coyote decoy, especially this time of the year.
A moving decoy is great for bobcats.
Jake he may mean that the movement is enough, no need for a lot of sound. Just guess....