The Arab Spring was not a particularly grand or impressive prediction that I made with his models, it was just one of many, but it was one of the few that I could simply invoke and be confident will be properly understood, without having to digress into a long explanation of who got it wrong and that they indeed did get it wrong.
Note that I did compare reading Moldbug as a superior alternative to reading the pundits at the New York Times. A prediction market or a particularly sane domain expert would obviously outperform on most predictions.
The predictions I remember Moldbug making regarding the Arab Spring were that:
Both are failed ones. Mind you, they aren't explicitly stated in the link above, but I think they're correct interpretation of his statements there. Certainly they'd be seen as good predictions if they'd been successful ones.
So may I ask what part of his model allowed you to make what predictions regarding the Arab Spring?
http://unqualified-reservations.blogspot.com/2013/01/noam-chomsky-killed-aaron-swartz.html
Summary: Moldbug on the Aaron Schwartz affair. Power is a very real thing with real consequences for activists, yet many people don't understand the nature of power in modern times. People like Noam Chomsky get great fame doing bad epistomology about who has power, and as a result do great harm to idealistic nerds who don't read between the lines to selectively target their attacks at weak institutions (Exxon, Pentagon) instead of strong ones (State, academica incl. MIT).
Here he returns to a theme that is one of his real contributions to blogospheric political thought: that victory in political competitions provides Bayesian information about who has power and who doesn't. If your worldview has the underdog somehow systematically beating the overdog, your epistemology is simply wrong - in the same way, and to the same extent, as a geocentrist who has to keep adding epicycles to account for anomalous observations.
This means that activists like King, Schwartz, and Assange are only effective in bullying the weak, not standing up to the strong (despite conventional narratives that misassign strengths to institutions). When such activists stop following the script, and naively use the same tactics to attack strong institutions, reality reasserts itself quite forcefully: