Throwing a bunch of numbers together and making salad doesn't mean the article is worth a damn. The essence of what the post is saying is that the glorious white race birthrate is declining and so it's causing it to lose control, the brownies and blackies are increasing their numbers therefore the country's strength is declining because the glorious whites numbers are decreasing and without the glorious white race to run things the culture of the country will become more inferior.
Whites still hold majority of the population and blacks are still hovering around 13% of the population and it's been that way since I can remember. These people should stop making excuses, the truth is that empires rise and fall, doesn't matter if you have inferior minorities or not. The USSR fell because it maintained an unworkable system in place by force until it collapsed on itself, it was the glorious white parts of its empire that rebelled and caused it problems.
You're greatly exaggerating, and that part is holding maybe 10% of the entire word count, and is not the main thesis of the text, like you are internalizing it.
Believe me, that part has been put in the mildest way possible, I've read it being presented in a 10 times more direct manner.
You can't discount the great value of 90% information, because there is some 10% argument that you personally have negative emotions for.