Non resolving, in that context, was a perfectly acceptable use of the term. People owning a system which is not particularly high resolution, or non resolving, can be forgiven for not understanding or even believing how one component or cable can be distinct in its improvement or worsening of the sound.
“I can’t hear a difference” or “I can’t hear it in my system” is understandable.
“I can’t hear it so therefore no one else can” is not.
I was in a high end dealer in Denver listening to early Wilson Watt/Puppies on Levinson gear with a Wadia CD front end. Quite high resolving for its time. Sounded pretty good and drew a small crowd. The salesman said he didn’t think the speaker cable was doing the system justice so he substituted what was actually a less expensive cable. Damn. The sound just expanded, much wider and deeper soundstage, greater low level detail, it was just flat better in general. I heard a gasp from a gentleman behind me and noticed his eyes as big as saucers. He said “I never believed in all that crap but man, that is obvious!!