"Audio Holography" is nothing more than stereo taken to it's highest level; it's not something different. Using our vision as an analogy, whatever is on the disc or record, is what we're looking at. Two eyes that visualize everything from a slightly different perspective, is what gives the world depth and dimension.
Two speakers projecting slightly different views of the same sound, when perfected; meaning everything in the audio chain is of a very high quality, produce a visual image of the audio. While the gear produces a perfect image, the room distorts this image by not reflecting all the sound waves symmetrically. Trial and error will get us in the ballpark, but since we can not see sound waves, we need professional help, or professional measuring gear in order to perfect the sound stage with room treatment.
We have identified the elusive holographic sound stage, and since it was a team effort, I think it has been defined to everyone's satisfaction.
Each time we upgrade our rigs, we are moving in the direction of "holography" whether we realize it or not. However, it's only when we actively pursue room treatment, are we actively pursuing "Holography".