This method described in the article to achieve consistent imaging across a wide area is only partially successful. I will try to explain why, and it is easy to test for yourself, on your own system.
We have a vocal located in center position:
View attachment 175016
Then we move it to the left, either by moving our listening position to the left, or delaying the right speaker:
View attachment 175017
To restore this, level is reduced on the left speaker and increased on the right speaker. What we get, is something like this:
View attachment 175018
The image moves back to center, sort of, but it is no longer a solid, consistent image, parts of it is still left back on the left side, and the overall impression is a smeared image that lacks the clarity and solidity of the original.
This can be explained from what is known about how hearing works. The higher frequencies are moved back quite well, so the higher frequency spectrum from the object is now moved back to center. The lower frequency part which depends on time arrival for location, is not much affected, and thus remain at its far left location. This gives an image that is now spread around and no longer resembles a solid, connected object with clear boundaries.
In the article, it is claimed that the objects are located in the same position when observed from across the whole listening area. And this can be true, for that specific system and set-up. For a system that is able to reproduce realistic images, which requires control across a much wider frequency range, this is not true - the images will change when you move far off axis, and it is not possible to fix this by manipulating level from the left or light channel speaker.
What can be fixed, is tonality and frequency response errors at far left or right locations, and this will also give a much better spatial impression at those locations. Allowing images to move a little towards the closer speaker is not destructive to the experience.