Nope. Not all lying to the FBI is a crime. It has to be material to an investigation. In this case, Flynn’s statements weren’t only not material to any investigation but weren’t even part of a legitimate FBI investigation. Flynn may have thought that he lied when he spoke to The FBI and pled guilty to the charge of lying to The FBI but his lying was not actually a crime. Of course, he would have had no way of knowing that when he addressed the court and when he agreed to plead guilty.
I’m not talking about Flynn’s lying to the FBI as “perjury.” His perjury exposure was when he stood up in court at his plea hearing and his first sentencing hearing and told the judge to his face that he (Flynn) was guilty as charged.