Whether you believe his claims are correct or not, how do you manage to read them as racist?

If all humans are equal, and one group wins, then it was either external factors or luck.

But if it is not luck or external reasons, then isn't that racist, because now you are saying Europeans are somehow genetically different (better), or have a better culture, and that is what caused their success?

I think you are mixing possible reasons. There are non-racist reasons.

There’s lots of random chance involved (New Guineans could have started in England) but because of those chance positions there are reasons things happened.

How is that racist?