The image is scanned progressively from the beginning. 1080 is an interlaced format, like mini dv. Both are 60i formats.
The HVX scans progressively, and then, in the case of 1080, or 480 modes, It has to fit that progressives signal into the 60i format.
So, in 24p it applies a pulldown in order to accomplish this. The same thing that happens to films, so they can be shown on our sdtv's. The HVX allows you two types of pulldown for 1080 and 480. The decision on which one to use, is an editing decision (whether your NLE supports pulldown or pulldown advanced) but will not have bearing on the image.
In 720 mode. The HVX has a pn mode (native) which means it only records the amount of frames per second you want it to. It is not bound by the 60i format. So there is no need for a pulldown.
Hope that helps.
In short the HVX is "true" progressive.