They say right in the article that this flaw would have been unlikely to bring down a plane. The most likely outcome would have been increased maintenance costs for owners.
Right. A normal wing will never bend 150% beyond it's limits in even the worst flight conditions. But it's a testament to how strict the FAA is about engineering new planes.
Remember the smug responses from Boeing and the number of US media reports when the Airbus A380 wing failed at 149% and they had to add (gasp) 30kg of extra stiffening.