None of the results indicate a possibility that the "energy in the black hole at the center of our galaxy" can be liberated in a giant explosion.

You're right about that. But they do indicate that the energy in smaller black holes can be liberated in giant explosions. And they indicate that black holes could be used as an energy sources. So when you said, "a black hole is not considered a store of energy that can be liberated," that was wrong; or at least it was wrong if you meant "a black hole is not considered a store of energy." And that was what I said was wrong.