Not at all, because he also says this:
The room has everything to do with it, as it's the only variable in this situation
(Assuming people always audition/judge speakers with the components they own)
I fully agree.
That's very true RT.
Those people also hear the improvements from better components, but just won't be hearing the full potential of the system.
The good thing is if you never heard your setup in a great room, you also don't know what you're missing and probably are just happy with the way things are sounding (which is fine ofcourse).
People that say it's just "a belief" really have no clue.
I don't believe any of them have actually heard their system is a great room; otherwise they wouldn't be provoking.