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What more evidence is there of a holographic universe beyond some flimsy suppositions about the CMBR?

Let us remember that current day holograms project an extra, third, dimension from two that are real, so let us proceed one dimension at a time…

The entropy that can be contained in any given volume of space can not be any larger than the entropy of the largest black hole that can fit in that space. The more massive the black hole, the larger the surface area of the event horizon. This means the maximum entropy for any region of space is determined by surface area, not by volume. This is counterintuitive because entropy is an extensive variable, being directly proportional to mass, which is proportional to volume (all else being equal, including the density of the mass). If entropy of ordinary mass is also proportional to area, this implies that volume itself is somehow illusory: that mass occupies area, not volume, and so the universe is really a hologram which corresponds to the information encoded on its boundaries.

Could it be that only our third dimension is projected as an illusion? The entropy of a black hole seems to depend only on the surface area of the event horizon of the black hole, not on its volume. So why does our third dimension play no role? Because if everything seen comes from the interference patterns of a 3D hologram, it could be projected from a 2D surface somewhere. Everything is connected to everything, in a hologram, the same as is indicated by quantum entanglement. Does this facilitate our perception of our local reality? Is this everything interpenetrating everything a form of rudimentary perception in and of itself? Are our abilities to have virtual realities in night dreams telling us something profound about how reality works or are night dreams just a isolated product of our imaginations and memories to give us some practice in living and/or to sort out the day’s events?