The judge asks specific questions to the defendant like...
Are you pleading guilty just to get a lighter sentence?
Are you pleading guilty because you cannot afford an attorney?
Do you understand that you are entitled to a formal trial and a judgment by a jury of your peers?
Flynn probably lied on half a dozen questions or more that will have relevance to a civil lawsuit or prosecutorial misconduct.
Did General Flynn lie?
With the full weight of the Department of Justice conspiring and conniving with Flynn’s own lawyers to frame him?
Nahhh. Why would he lie.