How does HyperHeat work? re: comparing heat pumps

I recently looked up some numbers in response to another Q&A thread on heat pumps (here: https://www.greenbuildingadvisor.com/question/new-heat-pumps-malfunction-or-unrealistic-expectations) and was struck by the data from the Mitsubishi HyperHeat units compared to conventional heat pumps.

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I pulled the data below off submittal data but not sure how to read it. Seems to me that the carrier two ton units match or outperform the Mitsubishi on SEER and HSPF however the actual BTU performance looks pretty bad. For example the 18 SEER Carrier drops 50% of it&#;s heating output from 47 to 5 degrees F. How is it possible for a 13 HSPF unit to underperform a 9 HSPF unit by so much?

I realize &#;2 ton&#; is a nominal size so these could be apples to oranges comparisons. The Mitsu could simply be a bigger unit marketed as 2 ton. 

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What exactly is the Hyperheat doing to make those abundant, low-temp BTUs possible and why doesn&#;t Carrier pick up on that? And how come Carrier&#;s low performance merits such high HSPF ratings?

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