That was a false dichotomy, claiming designers who listen don't produce transparent gear. This is not only false, but imo it's possible for designers who listen to produce gear that's more transparent vs those who do not. For example, coupling capacitors... a Solen MKP might get the job done and measure the same as a Jupiter copper foil cap, but if you listen you'd realize the Jupiter cap is far more transparent. Some things you can't measure, or we don't understand how to interpret the measurements. Obviously those who disagree with that statement may disagree with what I'm saying, but audio design is both art and science in many ways, and it takes both to make the best gear. Those who do not listen are bound to make poor choices as a result and will never make the best gear.
I bet there's more great designers who don't care to listen. Peter Walker didn't listen before his gear went out. He had a lot of happy customers; one of the most successful designers in audio history.