[satvikpendem]

Indeed, I just wrote a sibling comment before I saw yours about the same phenomenon, hyperphantasia. I don't think that the parent is right that it's just "memories and concepts," it actually is vivid imagery for most people who don't have aphantasia. It does seem like the parent has some sort of aphantasia, just not as severe as seeing nothing, it seems to be more of a spectrum rather than a binary.