Saying 'I don't actually have that melody written down anywhere, but I easily could have, if I'd run this program' feels a bit like saying 'I don't have that melody written down anywhere, but I easily could have if I'd just thought of it first'.

You may say that in fact having the code that generates the data is effectively the same as having the data. This may convince reasonable, rational people, but the fact that we're dealing with the law that we are should tell you that we're not dealing with reasonable, rational people.