From the original NY Post article, he was "managing director of food, beverages, and restaurants" so presumably the staff in question were food service workers,

From the original NY Post article, he was "managing director of food, beverages, and restaurants" so presumably the staff in question were food service workers, where they have to move around the kitchens or other areas as part of their duties. (I'm not claiming that "walking pace" is actually related to performance. But that was my read of how it was at least tangentially relevant, similarly to how "typing speed" might be tangentially relevant to roles requiring the use of a computer.)