Sure, that diagram showing what wider rims do to this aerodynamics of a tire hoopla means absolutely nothing in the real world. The amount of drag a 23mm tire on a 19mm rim compared to 23mm rim is so small it's not even worth mentioning, but when HED 1st released this wider rim they claimed absolutely ridiculous numbers like 30-40% more aero than a traditional setup, and quickly took that down when they couldn't back up those #'s, you're just not going to "feel" any aero advantage whatsoever. If this was some groundbreaking advance in aerodynamics all the pros would be riding 23mm wide clinchers, but they don't, they ride tubulars. What you do feel is like you're on rails, as if on a tubular. Cornering grip is vastly improved for 2 reasons, takes less psi to get to an optimal pressure, you basically run 10-20psi less than usual, secondly the sidewall is more supportive and not rolling as with the lightbulb profile on a standard 19 or 20 wide rim. I like 23mm wide rims, build with the Velocity A23 on a regular basis, and I ride them almost everyday and they do roll great.
Here's the 1st review that cyclingnews did back in '08.
http://www.cyclingnews.com/reviews/hed-ardennes-wheels
Note the 3rd paragraph about aerodynamics of the tire/rim combo:
While we don’t have any independent scientific data to verify HED’s claims of improved aerodynamics and lower rolling resistance, we can comfortably say that they don’t feel any slower yet offer a much-improved ride quality, a smoother feel overall and vastly improved grip. At under 1400g a pair, they are also some of the lightest non-carbon clinchers we’ve encountered.
And there still isn't any test proving that this rim/tire set up gives any usable or significant aero advantage, probably because there isn't any.