It turns out Vitiate never made a holocron, just altered the lattice of one:
In his youth, Valkorion--then known as Tenebrae--discovered a way to twist and pervert the lattice so it could capture the spirit of powerful Force users, locking them in a metaphysical cage. He used the weapon on Dramath, his tyrannical father, and trapped him inside the holocron for centuries.
The Old Republic Codex: Dramath's Holocron
Looks like Sheev still wins.