Something I have come to realize is that the Americans that work in the DoD seriously buy into their own koolaid. Their arrogance is truly astounding and they make no effort to humble themselves due to their belief in exceptionalism.
I suspect it is because those that choose to work in DoD in the US are generally those of lesser intelligence
What else can they really do? They just need to keep their heads down and work harder on what projects they have. And yeah their government will pay them a larger budget, but there's not enough money in USG to outspend China's own budgets.
Tbh I'm surprised they're not making their own test. I was under the impression that NGAD is currently roughly near the 2001-2002 J-20 prototype stage. There should be enough material to show the public, and then from that point on, nationalistic coping will do the rest (in saving face).
They don't need to show a free flying NGAD over test grounds and allow potentially embarrassing photos if the plane isn't fully finished. They just need to find a 5 second footage of something flying, it should not be hard to cover up any pre-production flaws in a doctored video.
Edit: at this point even a taxiing test of NGAD will satisfy Americans massively.