What's more convincing to me than self report of image quality is self report of imagery use. Whether it should be described as aphantasia I don't know, but I never think in a visuospatial way unless I consciously stop and try because the problem really requires it (and even then I feel I'm pretty bad). On the other hand I have friends that describe their ideas in such a visual way almost instantly, and report having imagery pop into their heads naturally.
To me it seems really obvious that relative to my internal monologue, my imagery is much weaker and quantifiably less frequent. So I think at least people that report having imagery much stronger than internal monologue likely have something different going on for real, not just with reporting.
To me it seems really obvious that relative to my internal monologue, my imagery is much weaker and quantifiably less frequent. So I think at least people that report having imagery much stronger than internal monologue likely have something different going on for real, not just with reporting.