This is Kim’s test of whether Trump will blink, like every other American president. He believes all the powers in the area want nothing but status quo and he wants to get paid off for it. Right now, Kim is practicing bravado for the home audience. (If he actually thinks Trump will blink he’s gravely miscalculating).
My bet is that Kim will get into next week and then say, to show his magnanimous, peaceful desires, he decided to not fire the missiles as a gesture of his own greatness.
Your scenario has logic inside it. Use the Superpower to show your subjects you are at his level. That this all is a bluff. Let’s hope puffy Kimmy will go there. Anything else is suicide for his country, so I just don’t understand that kind of behavior (and how everyone else, even his generals, are trapped by one family, what are they, the guards at the Wicked Witch’s castle?).