As the article goes on to say;
"As you can see from the pic above, this new cage is ideal for almost anything roundish and fairly light weight. I think the idea actually came from Kid Riemer zip tying his insulated Nalgene bottle carriers to his snow bike fork legs. Other bike nuts and adventurers were also doing this. After experiementing a bit we found out you could carry a lot of different things with this thing. "
Salsa are really innovative in their approach to this kind of thing - I've commented before on the nice, practical touches like the gentle curve in the beds of their racks (so a sleeping bag, tent or mat fits in nicely) and these seem to be an extension of the same philosophy. Great stuff for adventure cyclists.