It stated the bolts gave way. So either the bolts were bad or what the bolts were attached to was not thick enough.
The bolts shouldn't be engineered to take up shear loads anyway. If the engineering that determines the hang of the deck on the cables results in shear loads on the bolts, the bolts are going to shear. That prevents the twisting torsion from twisting the entire deck which would mean that they would have to demolish the entire thing and start over.
They are going to have to replace the cables with cables that make the deck hang where it should be. The expansion plates at the entry and exit of the deck are what takes up contraction and expansion of the cables. Right now, at least in the pictures, the deck is not hanging level. That can only be solved with correctly engineered cables.
In a way, they are fortunate. They do have the unfinished and unused side to put into service while they fix the failed side. But the highway is going to be closed for a while.
I just took another look at the pictures. They may be very, very lucky. It actually looks like the deck is hanging level. It looks like the exit ramp (if I have the directions correct) is the problem. Having the bolts shear is like winning the lottery. If the bolts hadn't performed properly, they would have to replace the deck. They have to redesign the bearings, the expansion joints and the levels of the exit and entry ramps - but they probably could have traffic on the bridge in a week, if what I see in the pictures is all that is wrong.
