I dont think anyone argues here say his setup didn't sound good, it's a matter of how good it is, and it's different for a untuned setup in room from the DSP tuning a setup above schroeder frequency. I think it's pretty well know a anechoic flat speaker above t he schroeder frequency should be what chased after and the less room induced variation the better, even if say his setup is tuned by the designer of the whole room, by DSP, it can still shows in a real good setup, the distortion is low and phase is really lined up and great etc. I remember seeing somewhere quite a while ago in ASR the D&D 8C or even Amirm's Salon 2 in room is not really flat or anything near to the predicted in room response, so this ask for measurement is at least, for me to be seeing how well technically the whole thing including the room and the contractor to build that can go, and in future, if someone with a Genelec, or XYZ brand studio can do similar measurements and we start to have a comparison.
it's sort of like arguing or debating whether a Ferrari or Lambo or a Nissan GTR is faster, measurements are like the 0-100, power to weight ratio etc, and in room measurement is IMO, a way to measure a whole system performance, more like the Nurburgring lap time for sport cars.