Greg Eghigian, a history professor at Pennsylvania State University and expert in the history of UFOs as it occurs in the context of public fascination,[28] notes that there have been many instances over recent decades in the U.S. of people "who previously worked in some kind of federal department" coming forward to make "bombshell allegations" about the truth regarding UFOs with the whistleblower claims by Grusch fitting this pattern.[29] Eghigian described the 1940s-50s media enthusiasm about flying saucers, and comments that the successful books on the subject by authors Donald Keyhoe, Frank Scully and Gerald Heard, "provided the model for a new kind of public figure: the crusading whistleblower dedicated to breaking the silence over the alien origins of unidentified flying objects."[30] Since then all these similarly credentialed claimants have been unable to provide any further corroboration.[30] Eghigian noted the All-Domain Anomaly Resolution Office denied all of the claims made by Grusch and he questioned the veracity of Grusch's claims. According to The Guardian:
Eghigian is also skeptical about the veracity of these claims because it looks like Grusch followed Pentagon protocol in publishing this information, meaning that the Department of Defence approved the information he would pass on to the press, which is something the department only does if the information is not classified. If Grusch is telling the truth, surely this information would be classified, Eghigian says, and the department would not have allowed him to go on the record.[29]
David Grusch UFO Whistleblower Claims
https://en.wikipedia.org/wiki/David_Grusch_UFO_whistleblower_claims.
Re: the Department of Defence approved the information he would pass on to the press
As I understand it, the information Grusch passed on was cleared by the Defense Office of Prepublication and Security Review (DOPSR) and that information was reviewed mostly to make sure no classified info was included and that Grusch had not violated his NDA.
As said, I think that's what Grusch meant when he said he had followed protocol (in other words, Grusch was saying, in effect, that he hadn't broken the law).