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eh, a lot of it is hypothetical and there are a lot of unknowns. The infinite density theory one is supposed to be at the very center of a black hole where an infinitely small dot contains all the matter of a black hole. A black hole always has a specific quantity of matter composing it, it is the infinitely small dot portion that makes density hypothetically infinite.
So there is the question of, are you treating the event horizon as the volume of the black hole? calculating an inner portion to have said volume based on some other theory?