Second time we’ve seen this today. They don’t explain what they mean by ‘intentional’ - whether it was outright sabotage, or cutting costs and time, or what.
It would have to be the inspector intentionally passed inspections on faulty welds. I was a welder and paid my way through college as a structural welder. No matter how good you are a weld will have a flaw you can’t see but is picked up during inspections. You grind away the flaw and resell the joint.