Nothing in that catalogue provides evidence of the government having exotic technology, the fundamental principles of which were completely unknown to the public. Governments can commission custom software and microchips and keep the details of those secret, but those things still operate on principles already known to the public; electronics, exploiting software, etc.
When has this ever not been the case? Maybe gunpowder in the middle ages, when it was best understood by secretive alchemists and utter magic to everybody else. But in the modern scientific era, what are some examples? Even wacky shit like cavity magnetrons don't fit the bill; the basic premise of EM radiation and even radar was already public knowledge by the time these technologies became militarily relevant. The devil was in the details but the broad strokes of the thing weren't utterly exotic.
Even in the case of nuclear weapons, the broad foundation of theory was already public years before they were brought into existence. A great many details were kept secret, but the broad strokes of the thing wasn't secret. When Werner Heisenberg and his colleagues, now in Allied captivity, first heard of the atomic bombings of Japan their first reaction was disbelief.. because they thought such bombs weren't practical to build. But they knew most of the theoretical basis for such bombs already and once they became convinced the bombs were real they had a pretty good idea of how they must have worked.
But then you have alleged antigrav. There's no theoretical basis for such a technology known to the public right now. Nobody can say "well it could be done with XYZ but it would be very tricky to design and expensive to build.."