I did not say there is not a lot the US Government knows about UFOs that it does not share with the citizens. I said I thought this story was BS.
I will even go so far as to point out that one way to keep a secret is to cause it to be lost in a plethora of lies.
Just to be absolutely clear—imho there is no unified .gov that does or does not know things in this area.
All that knowledge is highly compartmentalized.
My point is that the most knowledgeable folks are not .gov officials but are in fact private contractors for companies like Lockheed, Boeing (and some other names we may not know).
Look on the Internet for quotes from an old Lockheed Skunkworks guy—Ben Rich.