Actually I think Bruce's doubts were justified. Look at the opening words:
I take this to mean that where a spirit is of a defined class, the class must be stated. For example, if Jack Daniel is truly bourbon, you have to say so on the label. But the company presumably takes the view it is not bourbon, a view I share for what it is worth, and therefore the label reads "whiskey".
I have reason to believe that in practice, but we have seen apparent instances in numerous contexts, labeling doesn't always hew to this standard.