At a rough guess....
it will allow you to run a slightly shorter turnbuckle link between the same pivot points on camber block and rear hub...
there will be slightly less force from roll on the hub pivot.
This will help stop the outside tyres from rolling over too much and losing traction/sidebite, whilst still allowing the roll needed to get the car to pivot smoothly and fast
The outside tyre rollover is a bit of a 22 trait and coupled with the far too good steering system makes the back end feel loose until you can balance the weight of the car to suit driving style!
The thing that concerns me about this mod is the height that the inner ballstud will be sat when fitted... in testing i preferred a 1mm shim under inner ballstud and 2mm under hub ballstud as i felt the car was a bit more aggressive with turn in and squared up quicker which i liked.... although a fair few drivers preferred the reverse.
It's an interesting mod and definitely worth trying, any extra tuning options are a bonus so top work Cream