I don't buy the correlation between testicle size and sex drive. I've got proportionally small to average sized testicles and my sex drive is off the charts.
The article presents no data nor does it discuss how strong any correlation there is between testicle size and any other variable. The article mentions two documents: 1) a popular book that mentions a correlation between testicle size and assertiveness, faithfulness, honesty, life expectancy, and self-esteem, and 2) a genetics study of polygamy in two species of voles. There is no mention of sex drive in the article. Besides, any mention of assertiveness, faithfulness, honesty, life expectancy, and self-esteem isn't related simply to "big balls;" rather, it's the size of the testicles relative to a man's body size that seemingly controls these things. In other words, if you're a smaller guy with larger than average testicles, you probably have more testosterone in your body relative to someone who is larger than you with the same size testicles. The genetics study apparently found a link in voles that polygamy may be related to the vasopressin receptor gene.
With this line, "I just hope we shall have men who are men enough to invade the Congo if our enemies are cited there. For aggressiveness, level of risk, determination and the urge to rule over others are all products of ball size," it seems like the article was more an Op-Ed in a Ugandan paper rather than an article meant to discuss facts.