As Neuro pointed out in his first post, you need to be concerned with the sling lug loosening itself and the camera falling free and not the camera failing at the attachment point. The sling lug could come free if you've detached/reattached hastily without a good tightening or other twisting and turning of the sling. Even Arca plates loosen with use and need the occasional tightening.
Actually, camera falling is my main concern.
I did not notice any type of fail safe retaining device. Maybe something looped through the traditional neck strap attaching point and the sling strap.