I ma not smart, but from waht I gather they compared the energy that you would get from a black hole in a 10 dimensional string theory world to the energy you would get in a "lower" dimensional world with no gravity and they matched.
You would think that there would be differences in energy between these two different worlds, but they found otherwise, thus jumping to the conclusion that the same could be true for our world. All the energy in our wold could possibly consist in a lower dimensional world.
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