I would be super curious to see that study! Some friends and colleagues have done diet studies on coyotes, and found the number to be quite a bit less than that. Even in NYC, our densest city in the USA, the coyote population mainly eats wild prey (i.e., rodents and other small mammals, bugs, plants, etc.) just like their rural & suburban counterparts.

Regardless, keeping cats indoors and dogs on leash will pretty much prevent anything from happening to them. Outdoor cats are a major killer of wild birds, so yet another reason to keep our kitties indoors.