Presuming this is aimed at our bothy article from a few years back?
The phrase "camping without a tent" and of course the bothy code itself come from the
Mountain Bothy Association itself. Walkhighlands' isn't involved in the writing of the bothy code, which as it stands doesn't state you must bring a tent. We do however support the MBA (also 30 years experience, and plenty of work parties and past work as a maintenance officer). We think it best to promote their official guidance in our old bothy article, rather than write our own guidance.
I can't personally remember there being a different bothy code, but if you'd like to see changes to the bothy code you could only achieve this through involvement with the MBA itself.