It uses a dedicated subset of the Apollo Core, specialized for the Vampire V2 cards. Just like Phoenix was an even smaller subset, for the V1. Or else there would be an FPU (which the full core has), and binary compatibility with ColdFire and whatever else the "full" core offers.
How many times have we been told to not mix what the Apollo Core offers with what the Vampire offers? And still people talk of them as they were one and the same? Why is that?
You are right Kolla, this time. HP is (or will be) the part of Vampire Apollo core (not public yet). Like for some other features there is no or little sw support. Gunnar did explain on the Apollo forum how to make use of HP on AmigaOS for some real speedup. We will see if something will come from this.