armagnac2010
It does not demonstrate only one blade will depart. It demonstrates a safe shutdown for all the consequences of the intentional release of a single fan blade. So if that single released blade takes out a couple more blades then the engine must still be capable of being safely shutdown. Mostly nobody cares about all the other engine damage as long as it doesn';t catch fire or break its mounts
Of course there will be unbalance loads including even at windmill conditions. However once shutdown most of the rules govern the aircraft .
Some other poster presented a video which opinioned that windmill vibration loads will break things, including the inlet nacelle. It is important to understand that the greatest load condition across al the engine flanges including the inlet are at the instance of about 5 rev of the fan in rundown.. the windmill unbalance loads loads are minor. Of course aero loading to seriously compromised surfaces must be considered