There lies a basic problem of understanding,by those that either follow information blindly or are not sharp enough to read properly.
The box details are from the relevant British Standard for beehive construction - absolutely nothing to do with any 'standard' box as they were all part of the Standard (it had a number attributed to it in a series of literally hundreds of British Standards over the years. BS12 referred to portland cement, per eg and 4550 to concrete, IIRC).
That standard simply defined three standard size boxes viz: Shallow, Deep And Extra-deep and probably the frame sizes which fitted each (leaving the appropriate bee space when stacked on upon another.
ANY box can serve as a brood or super. Clearly the deep box is favourite as a brood box, but equally the shallow is a brood box when used for 'brood and a half'. Some use deeps as supers (as well as broods). I have used extra-deeps as supers several times over the years.
So it is simply a matter of people not understanding that it is not a Standard National at all. It is a British Standard for a hive designated as 'National' for Britain.
Some have clearly not noticed that frames are designated as SN, DN and (generally) 14 x 12 beacause the frame size is the important part of the jStandard. The boxes were sized to accommodate the thee frame sizes, all of which used long lugs and measured 14 inches across the working dimension.
Super, simply meant a box over the Queen Excluder. Nothing else. A brood meant a box for raising brood. Very simple but very difficult for some to comprehend?