I interpreted the story about cables being tightened referring to cables internal to the span, intended to keep the concrete in compression; not suspension cables.
I am quite sure that there are no internal cables within concrete that can be tightened or loosened. They simply did not build the center support that should have been from the ground up to the top of towers, then the cables down in the places with exposed bolts awaiting them. This was a Cluster Foxtrot, and someone needs to go to prison for murder.