See my tagline below (which should disqualify me from commenting but that's no fun), but the whole list is meaningless. For example, Pasatiempo drops 9? In my view as much as I love Pasa, it should be on a holiday from the list as it has been 9 holes only for last year-plus. And how many panelists have played the updated Olympic, Oakland Hills, or Medinah #3?
What has improved at Pebble (or negative changes in the courses above it) to justify a 2-position rise? Did the slightly lower bunker profile on Sand Hills #7 cause it to drop one spot? In what universe was Sheep Ranch ever one of the top 100 courses in the US? The Valley Club is now 58 instead of 49...what happened there (probably nothing)?
Etc etc.
To expand on Tom's point above, the old GD groupings of courses by "First Ten, Second Ten..." was better IMO, with courses listed in each grouping alphabetically.
PS, re some comments about True Blue. I am not familiar with the course at all, but the name itself possibly sabotages its rating. No idea about the name origin, but just as I view "Pete Dye Golf Club" or "Robert Trent Jones Golf Club" as horrible names for a golf club, I'd put TB in same category. Maybe even worse.