Wands aren't just for T foils, there are also wands controlling L-ish foils on Long Shot, TOP SPEED = 43.59 knots
"Longshot is a hydrofoil trimaran with a biplane rig. Two curved foils are mounted beneath the outer hulls, and a third foil forms an inverted T at the bottom of the rudder. The angle of attack of the outer foils is controlled by surface sensors attached forward of the outer hulls with flexible struts."

The wands on Whisper appear to be very slick. When they put the boards down there were no connections to make between the levers and the boards, and it looks like they fit into the trunks. On a moth and stunt there is a lever connection point mounted forward. Also a moth can't raise the foils, so there seems to be some interesting engineering on the Whisper.
Based on the video, the whisper seems to foil in the light stuff very easily. It seems like there would probably be too much foil area for the heavy winds if this works anything like sail area does. Time will tell on that speculation, but have seen moth videos where they said that it was too windy to get downwind. That could be just from too much sail area, but it could have something to do with foil size as well.