Right, it's a matter of geometry. In many ways the bottom corners are already connected (through the suspension, subframes, crash bar, etc) to each other. The tops, however, can flex around bit as the body twists and rolls. The point of the strut bar is to stiffen the front of the car against that flex/twist.
All things considered though, I don't see how he's going to maintain exactly the stock rigidity with this taller plenum. If it were me, I'd probably go for a compromise between the current hack (remove horizontal bar) and the photo above with the bar angling out to the front. Do a single wide bar like the one in the photo, but angle it around the back tying to the base of the windshield like the small bars do on the stock system. At least then the center of that angled flat bar will be fixated at the center.
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