I tried to read that fairly lengthy post, but I'm afraid I couldn't get much past the first point: that race is a social construct. I've heard this canard too many times. It simply defies all common sense. Yes, it's true that the human race can be divided in any number of arbitrary ways, just as the visible spectrum of light can be divided in any number of ways, but that doesn't mean that the colour "red" isn't objectively different from the colour "blue".

As Steven Pinker has observed, "races" are nothing more than large, extended families. We don't expect genetic traits to have similar frequency in every family, so we shouldn't expect it in races, either.

This much is just common sense. Those who argue that there is no such thing as race are trying to eliminate uncomfortable questions before they are even asked.