It isn't really rejecting tribalism, it's something more akin to the 'FairBot' tribe from the article. It is a way of selecting members based on adherence to a very complex set of tendencies and behaviours; in other words, a Shibboleth. It's been more successful in the recent term because it has succeeded in identifying tribe members independent of ethnic origin. It absolutely does not shy away from rejecting people who fail at performing the Shibboleth and it doesn't care if those people are the direct descendents of tribe members. Exhibit A: the number of people in prison in the West.