Kind of pretentious to claim they know the 50 best 9 hole golf courses in the world since they have obviously only sampled a small fraction of the 9 hole courses on the world.
It became obvious they didn't know what they were talking about when they put Bushfoot in their list.
The first time anyone does a list like this, there's no way to cover all the bases, and it's inevitable that there will be a handful of old standbys that don't belong. I have not seen the Hotchkiss course myself but listing it in its present condition is wishful thinking based on what I've heard about it. Likewise the little course on Cape Cod is a lovely place but probably not one of the best nine-hole courses in the world.
But they did include a lot of great choices, and in Googling the ones I wasn't familiar with, it seems like they included some real hidden gems. The two in Spain both look amazing. There is also one in Norway I could have let them onto, but I don't remember being asked directly.
What will happen now is that readers [and Golf Club Atlas] will give them a bunch of free input on what they missed, and the next time they do a ranking it will be much more thorough, and the chaff will be removed.
The one I am amazed they did not include is the Valliere course at Morfontaine. That should easily be in the top ten. They made a rule to only include stand-alone nine-holers, which makes sense, until you consider they're fencing out a course like the Valliere from all the rankings they do.
P.S. I don't know how they ranked them from 1 to 50 since they didn't ask me as a panelist to vote on them.