we don't even know from the info above if Ducati are actually aware of any of this .....

also Ducati will not have fabricated the radiator, it would have been supplied like many other components, ready to fit, it will have been unwrapped, given a once over and fitted, all new and shiney, the guy fitting the rad won't have known the supplier had sent a poorly constructed rad, it would have looked like the other 100 or so on the pile ...