The Enforcement Division may initiate certificate actions in the form of certificate suspensions and revocations against persons and entities holding FAA-issued certificates. Certificate suspensions of a fixed number of days are issued to discipline an alleged violator and to deter others similarly situated. Suspensions of indefinite duration are issued to prevent a certificate holder from exercising the privileges of a certificate pending demonstration that the certificate holder meets the standards required to hold its certificate. Certificate revocations are issued when the FAA determines that a certificate holder is no longer qualified to hold a certificate.
His emergency revocation couldn't have been very severe if they allowed him to get a pilot certificate again in such a short timeframe. The NTSB appeal was in 2009. The accident was in 2015. Considering the process needed to have the FAA remove the revocation status.... This one you can blame on the FAA more than the pilot!