Since it is beamforming in the vertical plane, this directs the main lobe of the beam at the listener's ear height, while putting nulls toward the ceiling and floor. Should help with room interaction even more than just a line array.
The HF response is where the human ear supposedly gets time information, like from a snapping twig to get directionality. They are different hair cells on the inner ear than the ones responsible for frequency response. At least that is the research I have found.
Just nice to see that the HF response of the array is not falling off about 10KHz.