Earlier quoted context omitted.
Why?
Because intelligence agencies generally have a vested interest in spreading subtle propaganda, such as by distorting facts. Now, I have yet to see any cases of the CIA doing this to the World Factbook, since that would tank its credibility, but I also don't browse the Factbook too often.
The world factbook was mostly things that the military or politicians might care about the truth of, and data they need anyway. Mostly what is there were things where there wouldn't be much value in spreading lies - and what value that might have is outweighed by you can fact check everything (with a lot of work) so lies are likely to be caught.
Not saying they are perfect, but this isn't a place where I would expect they would see distorting facts help them.