Ghostwriter impeded the investigation by deleting the recordings. Luckily for him he’s a Democrat.
This is the actual definition of that "obstructing an official proceeding" law that they put so many Jan6 people in jail for. It was written because Enron shredded files so they would not need to provide them under a later subpoena. It wasnt obstruction of justice because they hadn't been served so congress made doing that a felony via that 'obstructing an official proceeding' i.e. a hearing.
J6 people rot for not doing that while this guy is probably having crackers and brie at some beltway cocktail party, totally carefree.