Another gobbledygook article spewing chaff out like a fighter jet being pursued. It leaves nothing on the table but obfuscation and avoidance of the issue. DARPA/DoD just refuses to give up control of the issue. One thing (the existence of UFOs) leads to the ultimate issue of who owns them. DOD knows. They have been in ET contact for decades with some of the entities.
The DOD isn't a single monolithic entity. Like it or not, it is a massive bureaucracy with thousand of stove-piped nooks and crannies, some of which have the information you mention re: contact with these "entities."
Even the upper levels of the Pentagon have no idea what is hidden away...and, for purposes of plausible deniability, they are not going to be told.
This article, though certainly not a discussion of what the government knows, explains simply why it would be naive to expect the government to unambiguously disclose what it knows.
Just ain't gonna happen.
All that said, those in the government have been releasing little dribs and drabs of information that do paint a pretty clear picture of what we are dealing with (as they understand it). That's probably the most we can expect.