Maybe they are showing us just what they want China and others to see to lead them down the wrong path? Disinfo? For all we know, DARPA may be ten years more advanced than what they are showing here.
You are likely closer than most others.
Even though the Putinistas and ChiComs may think its a fake, they are also paranoid enough to try to develop a defense, thus burning up piles of rubels and rice$, just like Reagan’s Star Wars.