So, you admit this, but, at the same time, you questioned someone’s findings without posting proof of blind test? I call this hypocrisy. Please correct me if I misunderstood
You aren't trying to understand. You glossed right over the fact I already gave the answer.
But for anyone else reading: As I said, the difference is: the proposition that different speaker designs will be quite audible is not only uncontroversial: it is well established in practice, theory and also via classic scientific methods (e.g. blind testing of speakers).
That is NOT the case for many of the more controversial claims in audio, such as that expensive USB cables will sound "better" than properly functioning cheap USB cables, or similar claims.
Therefore it makes sense to treat the more controversial claims more skeptically.
Of course such obvious differences will be hard to spot if someone is wearing black-and-white blinders and can only see in an "either/or" manner.