When asked to "picture" something, for some reason they assumed people would actually see a faint version of it in their visual field - and because they couldnt "see" it, they believed they had aphantasia.
e.g. when asked to visualize a clown sitting in a chair in front of them, they expected people to actually (however faintly) see a clown in a chair in front of them. To me that is hallucination, not visualization.
Of course, it could be ME misinterpreting it, and people do actually "see" things they visualize, and I have aphantasia.... How would I know? What is the experience for you? (if you dont mind me asking)