A bureaucrat does not like independent decisions, so he quickly deferred back to Nancy. Was the decision with other partisan political help or on his own? If he had help, that indicates an actual coup. The other joint chiefs agreed to support this unprecedented situation at a meeting. They say they are now willing to testify about the meeting.
If Woodward’s account is found to be accurate, Mark Milley should face severe punishment such as dismissal from the service with loss of all rank, honors and pension. (Enlisted guys get dishonorably discharged; officers get dismissed) That will never happen with Joe Biden at the apex of power; if Joe knew about Milley’s carryings-on, he would probably only be concerned that he get his cut.