The is another image of a lower smoke trail on IC at this link:
InsightCentral.net - Encyclopedia - Honda Insight Aerodynamics
But, it seems to me that neither smoke picture really shows us the stagnation point. Cd's tuft testing seems to show that blocking the lower grill, as completely as possible, would lower stagnation point.
It is interesting to note that basjoos created a pointed and much lower front end on the aerocivic to lower the stagnation point. Kinda makes one wonder if Honda had to make a compromise on the Insight/Civic nose shapes. Obviously, there were aero compromises in general, though the .25 Cd in near record for production cars.