David:
I did notice Humewood on that list when I read it again not long ago.
I really liked the course, but not enough to include it in my own ranking of the top 100 in the world today. There's some tough competition out there. It might be the #2 course in South Africa, and if you had a system which tried to balance out the rankings geographically, it would be a contender on that basis ... but it was certainly not the equal of a course like Prairie Dunes.