Not the person you asked, but a fellow Aphantast: I cannot imagine visually at all. End-of-Yoga-class imaginary journeys are completely useless for me. I'm also faceblind. But I can imagine music I'm familiar with without any problem, and have a inner monologue (it blew my mind when I learned that some people do not). Also I have visual dreams, but nowhere near to the level of details that I have heard other people describe.

I image a movie scene: There is a man sitting at a table in a cantina. He has dark hair, slightly rugged clothes. Standing next to his table is a little green alien that targets a blaster at him. The person is sitting low, at an angle that prevents the alien from seeing that he has drawn his own blaster below the table. I know all of this, but I have no visual image of it. If I had to draw what I see in my head it would be a blank piece of paper with arrows pointing at certain points, labeled with "Han", "Table" and "Greebo".