This is part of the classic debate around aphantasia – both sides assume the other side is speaking more metaphorically, while they're speaking literally. E.g., "Surely he doesn't mean he literally can't visualize things, he just means it's not as sharp for him." or "Surely they don't literally mean they can see it, they're just imagining the list of details/attributes and pretending to see it."
What I'm trying to say is that from his perspective, how he imagines people with more "normal" memory recall things, might be a bit exaggerated. He doesn't know what he's missing exactly so he might imagine it to be better than it really is. I'm not trying to say that everyone else is like me or that he's like me. Like if he can't imagine an apple in his mind at all and he hears other people can, he may imagine it's as clear as staring at an apple in real life or a picture of an apple on a computer screen, while the reality is somewhere in the middle. I do believe his claims about himself, but his claims about me or people like me don't seem entirely accurate.