I think what's so surprising is that they would run a secretive program in such a conspicuous manner, not that the secretive program exists.
It seems to me what's happening is a "Streisand Effect" where the whole attitude of "go away, nothing to see here" is in fact maximizing attention and defeating the purpose of hiding this away.
If it were me I'd put a band-aid on a drone, fly it to a person, and say, "we are testing military capabilities to render first aid to our soldiers" or something similar. It's not a lie, it's good optics, adversaries can worry about it... then put whatever it is on ice for a while until the heat dies down