Looks legit to me -- I've only got three courses in it, but they are all in the top 14.
For real: It's the internet. Anyone can create a ranking now and make it look authentic. They probably sold some spots on it.
For example, the course at #100, Hambantota in Sri Lanka, is the worst of the four courses I saw in Sri Lanka. It's a solid 3 on the Doak Scale.
I thought that was bad, but the course ranked #30 is ALSO a 3. It's not even in the top three courses at Mission Hills - Haikou!
I have played 42 of the 100 courses, and seen 10 others.
There was one course I'd never heard of -- Hanazono Golf in Japan. That's pretty amazing, considering how much research I've put in on The Confidential Guide in the past 2-3 years.