My guess is Dave Kittinger did not jettison the PSH concept, but the more the positional evaluation evolved, the more the effect became diluted.
Here is a comparison graph, including both Beluga and Super Nova:
Of course there are some family genes (this is true with most program series from any programmer), but more specifically I think the peak in Strategy skills is mostly inherited from the inital bare PSH.
6 years later (compared to Beluga & SN), there is no more such a visible footprint from the PSH in the Emerald Classic' Khmelnitsky test (check the Strategy skill):
MfG,
Tibono