Appeals waiver did not bar appeal of restitution, as restitution in excess of proximately caused harms exceeds the statutory maximum punishment. Sentencing court must establish statutory proximate causation for losses before imposing restitution, else, plain error.
http://www.ca5.uscourts.gov/opinions/pub/16/16-11208-CR0.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.