Hi...
Are you referring to the book that the SEAL wrote? I haven't read it, so can't comment too much.
One might be surprised to find out how much information that we might feel is secret is readily available through various sources, though.
Example: if anyone were to read any weekly copy of the Navy Times (a civilian publication), it would list where each of our aircraft carriers were located the previous week. And each carrier has a sub tailing it somewhere. The carrier also will be in the company of from three to five other warships. This might seem to be priveleged information to the uninitiated.
If the book referred to was written by the SEAL, and secret information was revealed, that may very well be treasonous, and calling for stiff penalties.