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Matter-antimatter annihilations result in massive amounts of energy. So all of that matter that was being held in a location gravitationally would be conserved in the resultant annihilation energy and would be emitted in the form of mostly high energy photons (however other particle emissions are not forbidden). In fact, the amount of gravitational energy due to a massive matter/antimatter object is quite negligible compared to the mass to energy conversion of the annihilation. So he's not entirely wrong, besides the antimatter black hole, which is non existent and pure energy, which is kind of a misnomer.
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[–] invariantMass ago
Matter-antimatter annihilations result in massive amounts of energy. So all of that matter that was being held in a location gravitationally would be conserved in the resultant annihilation energy and would be emitted in the form of mostly high energy photons (however other particle emissions are not forbidden). In fact, the amount of gravitational energy due to a massive matter/antimatter object is quite negligible compared to the mass to energy conversion of the annihilation. So he's not entirely wrong, besides the antimatter black hole, which is non existent and pure energy, which is kind of a misnomer.