I don’t have aphantasia, but I think that I might be somewhat “learning disabled” in terms of being able to hold things in my mind in any form other than numbers or letters. For example, I have a hard time recognizing people.
I read an article in one of the Frum magazines once about people who have a hard time recognizing people. There is a name for it, but I forget what it’s called. I always assumed, at least in my case, that the reason why I have a hard time with this is that I have a hard time processing anything that is not in letter/number form. I don’t know if that is definitely true – that was just my assumption.