well they arent fingers. they are still anatomical legs.

they are ungulates. meaning they walk on a developed digit, yes, but the legs above that are still legs as a whole and are not without tendons and muscles.

and their abilty for running is more from directional of the torso to hip and shoulder girdle to how the legs are angled down. the digit is evolved for speed and less shock absorbtion from taking away from the speed to travel faster in a particular direction.

that person callig their whole leg digits needs to read up on quadrapedal anatomy