In line with the other comment on this post: I also am classified as “brilliant” by people and IQ tests. My country gave me an award for being a great inventor. But my memory is worse than anyone I know.
I can’t remember the lyrics to any songs, or the lines from any movies, or what I’m doing this week. I don’t think it’s a strong hypothesis.
My wife has a nearly eidetic memory, so marrying her was a game changer for counteracting mine :)