Not that this needs treatment (or is even curable), but I wonder how many people misdiagnose themselves as having aphantasia because of differences in how imagination works. Red apple test just doesn’t seem to be thorough enough. There were spikes of lactose intolerance, gluten intolerance and all sorts of other self-diagnosed deviations from the norm that has no connection to reality, its some quirk of human psyche to cling to any opportunity to feel “special”, mostly harmless but might but at times hinder search for help for those who really need it

I think the apple is just a small example to enable comparison.

People that actually have aphantasia will know from a lifetime of experiences (like thinking "counting sheep" is a metaphor), but might not know that the condition now has a name or that most others have a different experience.