My understanding is Flynn lied to Pence but it has not been established that he lied to the FBI. Mueller and Weisman basically busted him down so that he was broke and they were threatening his son with some kind of prosecution and he wanted out. They squeezed him on the inaccuracy of his recollection or something and also told him that the investigators interviewing him had reported that they thought he way lying so Flynn figure he was screwed and plead to a deal. THEY LIED TO HIM. The 302's of the investigator (strzok was one of them) said the opposite. ie. they thought that he was being truthful. In addition they told him he did not need a lawyer when they met with him because they just wanted to chit-chat which was another deceptive means of entrapment.
Flynn needs to have his case dismissed. The horowitz report will help his case considerably by demonstrating how crooked the FBI was. And Sydney Powell, his attorney is no slouch and she stepped in when he was too busted down to have an attorney. She is the right man for the job and I expect great things from it.
Flynn’s plea deal is busted down charge related to him illegally conducting foreign policy when he promised Kislyak Trump would remove sanctions on Russia. He then lidd to the fbi about it in a routine screening interview all incoming White House staff go through.
If he wants to vacate the plea deal then he will be prosecuted like Manafort and Stone and sent to jail.