Because this man is just an asset to perpetuate the narrative.
For example, recently there was a marine arrested recently for criticizing the govt. in a public forum:
The case of Brandon Raub: Can the government detain you over Facebook posts? | Washington Times Communities
That book "No Easy Day" is a complete fairy tale put out by the govt. The aforementioned author I mentioned in the first paragraph was detained and arrested and his book was ordered to be destroyed and not sold.
Now why would the federal govt. let someone without permission reveal classified information about a raid without any detainment, vetting, etc.
Fox News reported the govt. was upset and frustrated that this classified information was revealed in this "No Easy Day" book but nothing has been done about. No cease and desist order, no nothing. So it's obvious that they wanted to make it like this book really has some secret shyt in it that the govt would take offense to so the public would buy that the content in the book is really insightful.
As far as the interview the with "SEAL" it does not match up with the official story as provided by the White House. Eyewitnesses also claim that the helicopter crash this "SEAL" describes exploded after they loaded people into it. His story doesn't match up with the official tale. Like i've said, too many holes in the official explanation.
Also, there is no way to prove the validity of his claims whatsoever. For all we know, the man being interviewed is a CIA asset (just like Osama was for 20 years btw).