If both arms were moving the exact amount it wouldn't matter. But that's when the ARB isn't being used.
What we're looking at is the amount of twist for a certain difference in position between the left and right wishbone, and this increases as the ARB arm goes shorter.
You may need to look at things from an energetic point of view. As the ARB twists, it absorbs a part of the input energy, and the other part is being transfered to the wishbone. The amount that is being transfered to the wishbone increases with the twist angle. If the twist rate increases then more energy will be transfered faster to the wishbone, i.e. the ARB is "stiffer".
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