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when you turn the outside wheels see most of the load - the car tries to keep going straight so the bottom of the wheels try to push in which in turn reduces negative camber and contact patch. the concern is that on an oem car the only thing resisting this inward motion at the back is the pressed steel plate which can flex under load - the technobrace adds strength in this area.
conversely, if the bottom of the wheel is pushing in then the top is pushing out which is where strut tower braces come in - they don't need to resist compressive loads they just need to not stretch. hence you can use a light carbon brace or equivalent. personally i think they are useful in the front where the strut towers are not fully triangulated, but at the rear meh - there's a lot of metal in there already.
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