This is how TorHans tested all their equipment - it's a set of dummy arms that makes for very repeatable tests. Although if I'm nitpicking, I'll say that I don't think his hands are optimally positioned - I think it's usually best to wrap hands around the front of the shifters.
The TorHans company is bringing some thoughtful engineering into the world of aerobar-mounted hydration. I took an in-depth review at their Aero 20 product, which is both easy to use, and tests very well in the wind tunnel. See the article for a link to their wind tunnel data.