Or, perhaps, it is a large set of samples of the virtual piano all created offline with the Vpiano again run with the highest degrees of resolution. Perhaps at the highest degrees of resolution it's not even practical to run the VPiano in the cloud directly and it was necessary to create a sample library.
This would explain how they can get many different velocity sampling levels, round robins, and whatever other variations they are employing.
Again, I'm just speculating. If they've talked about what they're sampling, I haven't seen it.
Here's what they say about the "pedigree."
That could mean anything.The distinctive lineage that produced Tera Piano shows a family tree with all the right relatives in all the right places. Born of a legendary and timeless Piano. Captured and painstakingly nurtured by world renowned and award winning composers. Dressed elegantly and presented in a player designed and architected by hand-picked engineers from many known and beloved platforms. Adopted by you, the creator. It's going to be a long and happy life.