I can confirm that those are the Paul levers with two pivot positions that can be set for long-pull brakes. Both pictures show them in the short pull setting, the lower hole would be used for long pull. The pivots are secured with little c-clips that allow removal and repositioning.
Back when I was working as a mechanic I did a custom build of a Surly Disc Trucker with Porteur bars for a customer. We kept the stock long-pull Avid BB7 brakes and decided to go with these for the levers (they were still in production at the time). Like everything Paul they were super high quality and relatively easy to set up. My only memory is that it was hard to get the "bite point" right where I wanted it--the pads hit the rotor when the lever was just a little closer to the bar than I would prefer, but they offered fine braking once they did and the customer was happy with them. That issue may or may not present itself with v-brakes.
Paul Components definitely do their part to support tiny niches (142mm thru axle fixed gear hubs, anyone?) but I think these were probably fringe even for them. They probably only made sense right at the height of the fixie boom when bullhorn handlebars were more popular and reverse levers of all types probably sold better. Even then how many bikes with reverse levers use long-pull brakes?
-Jeremy Till
Sacramento, CA