That's not what equality of opportunity is referring to. It's about removing barriers and discrimination that would lead someone with equal or greater abilities

That's not what equality of opportunity is referring to. It's about removing barriers and discrimination that would lead someone with equal or greater abilities to do worse than someone else with the same or lower abilities. The phrase, "I believe in equality of opportunity, not equality of outcome" explicitly acknowledges that equality of opportunity will not yield equality of outcome. In part, because of the unequal distribution of talent that you point out.