one small issue
"the updates wouldn’t actually update anything. Instead they would “simply replace system files with the same version of the file currently on the system,”"
if that is the case, then it's not a very good test of your updating systme, as it's impossible to tell if it actually worked. it doesn't matter if windows update reports it has successfully replaced file a, with file a. if you have no way of verifying that it has actually happened.