Stayer bicycle use a very forward saddle position to allow the rider to get get into the slipstream of the leading vehicle. Consequently, the saddles could unexpectedly nose down and many stayers incorporated an adjustable tie rod between the saddle nose and top tube to prevent this. This looks like it would perform the same function with out the need to clamp to the top tube. In this case the saddle is not positioned very far forward, but it could serve to prevent a similar situation when shifting from a normal saddle position to a sitting on the saddle nose position, such as when one uses aero bar extensions. Just thinking out loud.