It's a far-forward triathlon-specific seating position. Supposedly it spares certain muscles so you're fresher for running.

Most road riders use "knee over pedal spindle" as a starting point for saddle fore/aft placement (that is, with your pedals on the same horizontal plane - parallel to the ground - the forward knee should be roughly over the spindle of that pedal). That's only a starting point, but it's very different from the tri position that that seatpost gives you.