The crux of the matter is the design intent. For any dipole or bipole radiator, the ROOM IS PART OF THE DESIGNER'S INTENDED SOUND. By discarding the room sounds and measuring only the anechoic response, you discard almost half of the expected acoustic. That's why dipole and bipole radiating speakers come with specific instructions as to room placement. If the speakers are to be measured, both the distance from the speaker and the distance from the speaker to reflecting walls, ceilings, and floors are critical. To measure a panel speaker near field or in an anechoic environment is the equivalent of placing a "bookshelf" speaker in a corner and on the floor for measurement.
For any planar-magnetic or electrostatic panel, the width of the radiating surface is also an issue. Although Amirm uses multiple averaged measurements across the panel dimensions, this (again) ignores the designer's intent. Specific peaks and dips in the frequency response ARE inherent in the physical geometry of the panel, but those irregularities are also taken into account (by the designer) in the room placement. To measure the panel characteristics in isolation (ignoring the effect of the room, again) distorts the design intent of the speaker.
And finally, the distortion characteristics of the panel speaker have been measured in isolation. In the case of the LRS, yes, the distortion may rise precipitously above 10 watts, but the average listener uses the speaker at one or less watts. Want lower distortion at higher power levels? Buy bigger panels with more radiating area!
I concede that Amirm's measurements are accurate within their (gross) limitations, but I strongly dispute, due to the way that they were taken, that the measurements are at all useful in evaluating the actual sound of the speaker in situ. Any conclusion drawn from these measurements is a disservice to any reader trying to understand the speakers' sound. You're free to argue this if you wish, but the designer would almost certainly agree with me - the ROOM is an inherent part of the design and any attempt to measure the speaker in acoustic isolation is grossly misleading.