I also thought that the microphones where too close right up to the midrange driver. They should've put them further away but not as far as you suggest as that would give a recording with way too much reflections from the room as microphones would pick up everything our hearing wouldn't “register”. I think 1-1.5 meters away would probably enough for the sound from all the drivers to sum up good enough acoustically for at least hearing the differences in bass output.
But anyway, such test would only be useful to determine if the sound is more or less bassy, but we already know that adding subwoofers will add more bass, so what's the point?

To hear what we'll integrated subwoofers bring to the system, the only real thing left to do is demo the difference in person.