When sentencing defendants, some district courts announce that they would impose the same length of imprisonment even if their conclusions of law and calculation of the Sentencing Guidelines range are later found to be in error, does that alternative sentence render any such error harmless, even though the error had serious consequences collateral to the length of imprisonment?

QUESTION PRESENTED When sentencing defendants, some district courts announce that they would impose the same length of imprisonment even if their conclusions of law and calculation of the Sentencing Guidelines range are later found to be in error. Does that alternative sentence render any such error harmless, even though the error had serious consequences collateral to the length of imprisonment?