David Pogue's biggest mistake was that curtain of fabric he suspended between the speakers and the panelists. The HomePod is the only speaker in the group (in the world?) that dynamically adjusts its output based on what its microphones pickup with regard to room acoustics. The curtain, acoustically transparent or not, could have easily resulted in the HomePod dialing back (or boosting) certain frequencies. Yet, the curtain's affect on the other speakers would have been negligible (or, at the very most, equal across them).
If the panel was acoustically transparent, the HomePod wouldn't have detected it, yes? If it was NOT acoustically transparent then your comment is valid.