It is a creativity test, but doesn't how you get there matter? From what I understand, aphantasiacs think in words, verbalized concepts, remembered facts, relationships, etc. So I'd expect that to make a visual analogy they'd have to first think through the properties of the thing -- "OK, I know this building is white, triangular, curved, near the water..." -- and then come up with other things those attributes describe. But I can just "see" the shape and color of the building in my mind's eye, and mentally make it be something similar, without any internal monologue at all. Actually, if you just gave me a written description of these traits, I'd have a harder time coming up with examples because they're just abstract properties without any specific image to anchor them to -- I could do it, but I'd have to think about it some. But doing the same exercise with a mental image feels much easier.