Very interesting...deriding something like this is stepping on awfully shaky ground as we really know so little about what we're dealing with so far as theory (or reality) goes. Whilst we have a reasonable handle on the dynamics of black holes, to say that we have such a good handle on how spacetime works, or even what it is, is even more fanciful than the speculation to begin with.
They maybe wrong, but they may also be correct in their hypothesis. There's nothing in physics which says that cause and effect have to be constrained by the flow of time. In physics, so long as the equations are obeyed and the fundamental laws are reversible (which is believed to be the case), then a cause in the future tense can have consequences in the past.
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