My son, an 18 year college student with no legal issues ever (except a speeding ticket) - had his Global Entry revoked last year. For no apparent reason. We filed an appeal and are waiting for a response. From everything I've read on it, it seems it could take upwards of 18 months to get a response. But per the article you linked, it seems that less than half are able to get it reinstated. So I'm not really hopeful.