I had a case much like this several years ago and the appellate court reversed the sentence and remanded it for resentencing before a different and unprejudiced judge. Walking back erroneous statements cannot unring the bell of a judge’s prejudice.
It is obvious that Judge Sullivan regards Flynn as guilty of far more serious crimes than he pleaded to or was even charged with committing.
Sullivan probably came into the courtroom before the recess with his mind made up about the sentence he intended to impose based on his erroneous views regarding treason and Flynn’s supposed role as an agent for a foreign government while serving in the White House. The judge may even have written out the sentence in advance, as many judges do.
Sullivan deliberately telegraphed his intention to impose a prison sentence in defiance of the joint recommendation of the Mueller and Flynn’s defense attorney, who agreed that Flynn should not serve any prison time.