That's not what this article is about at all. Anything that has any sort of transmission or recording capabilities has been banned inside of secure facilities

That's not what this article is about at all. Anything that has any sort of transmission or recording capabilities has been banned inside of secure facilities for as long I can remember, fitness devices aren't something that would need to be covered by a new rule. They don't want you wearing devices that share GPS coordinates because it makes it simple to get accurate locations of buildings and troop schedules. Instead of blindly firing mortars into a base, just look for where the GPS signals cluster at night and you probably know where everyone is sleeping. See a signal that goes from the troop quarters to the base perimeter, then goes back a few hours later? Probably someone on guard duty, now you can start figuring out when the shift rotations happen.