...seems a rather small sampling to try and draw anything from. Not to mention that the experiment hardly adds much in itself, as it was already known that the segment of tsundere fans liked when an initially unpleasant boy/girl love interest mellows out towards the protagonist, and all this study showed was that people liked such a development in a general non-romantic context as well.
That doesn't really offer much to latch onto as to why they like it, certainly not in a romantic context. Or what happen to differentiate the tsundere fans from everyone else (...if the reason for their attraction was to be found in general human nature, then wouldn't one expect the attraction to be very common?).
With the info presented here, the study thus seems rather lacking in scope, and the conclusions now unintendedly drawn from it shaky at best. Aside from the whole logical obstacle that if only a segment of people are attracted to a specific personality, then it probably have something to do with their own segment's specific personalities as well, rather than anything inherent to human nature.