Earlier quoted context omitted.
A true meritocracy wouldn't be a friendly world to live in. Think about the current state of education. Parents with resources over-optimize their kids' education because they understand the inefficiencies in the system and/or understand what it takes to become successful in our society.
Yeah this is the problem with meritocracy, it doesn't exist in a vacuum. The reason someone has merit is arguably _only_ due to external factors. You are the way you are because of your DNA and environment. You are who you are because of who your parents are and how they chose to raise you, but they are only who they are because of their parents. And that recurses all the way back to the first organisms.
Your DNA is not an "external factor". Rather, it's the most internal factor there is.