Viv Labs accept the overhang is incorrect and there will be more distortion. But they claim that other beneficial factors outweigh the effect of this disadvantage.
First that there is less resonance; but this does not seem to arise from the incorrect effective length; rather from the fact the arm base is not fixed to the turntable.
Second they claim there is benefit from reducing required anti-skating force. Surely the best way of achieving this is a parallel tracking design (eliminates it).
My take on all this is the company is being different for the sake of being different. They believe that by distinguishing themselves from all the other pivoted arm manufacturers they will garner more sales than they could be competing directly; that although their science is questionable (to say the least) enough buyers will ignore this..
This doesn't make the design right or better. We will not be able to reach consensus because there will be those who think it sounds better and those who think it sounds worse. This is the central problem of uncontrolled listening evaluations.