Yes indeed Jake, the diagram suggests that the two side foils are connected construction-wise.

In fact that would be logical, because you only need the foil on the leeside (and moreover at its utmost lenght).


Here's another explanational vid:

http://www.safran-sailingteam.com/media/new-foils-greater-speed-and-reliability-20160922
And go to the link on the right side for the video.

But this vid also doesn't mention the exact foil-construction.