Yes, but that doesn't reflect the inability to learn. You're confusing cumulative advantage leading to a competitive edge with an inability of lower IQ humans to learn advanced skills. You will also find things like richness and beauty positively associated with winning competitions too. That you will find this doesn't mean memory can't be improved. It reflect cumulative advantage more generally. It is one of the reasons for the cognitive bias of the halo effect, a statistical side effect of the principles underlying the Matthew Effect. Edges are edges.

Critically, that doesn't mean that the skills aren't learnable. It means that people with the most advantages can exploit those advantages to gain a greater deal of advantage than someone who has less advantage.