Indeed, it does - and based on other, independent wind tunnel data, it appears to me that the use of a non-UCI legal bar on the Speed Concept OCLV could account for its lower drag relative to the P4 at all yaw angles.

Indeed, even if you just rely on Trek's data (for the Speed Concept TCT) the Speed Concept OCLV version appears that it would be faster than the P4 only when the average yaw angle is >15 deg if both were fitted with UCI-legal handlebars.