Points are made to be overstated, otherwise there would not be much point in making points. Merely because a line of thought is speculative does not mean that it should not be, at the very least, taken into consideration. The fact that mainstream scientific journals such as Nature find the hologram-theory of the universe a hypothesis worthy of debate entails that we should, realistically, consider this possibility to be one that could be of some merit. A hologram is certainly not the equivalent of "the real thing", in the sense that it lakcs the projected object's objecthood. We cannot, of course, infer from this that something could not exist outside of the hologram, however we are only dealing with the contents of this universe, the one we are situated in. It is no stretch of the imagination to infer that the universe contains nothing, if it is indeed, through some bizarre circumstance, a simulation.