I misunderstood the article I guess. I thought they knew specifically what they were testing, i.e. 'we have altered the airplane this way and we will now do the

I misunderstood the article I guess. I thought they knew specifically what they were testing, i.e. 'we have altered the airplane this way and we will now do these things.' After the failure, they were able to essentially reconfigure the simulator to match the test parameters, rerun the test and observe the same failure in simulation.