Well those of us who have never heard of "momentary fusion" read the title to mean "momentary breakthroughs in fusion"

I never heard the term "Momentary Fusion". There are other pulsed fusion methods, like Dense Plasma Focus[1] with it's very hot but very short lived plasmoids. Also still far from being economically viable, but I would say has a much better chance than that weapon research on NIF[2].

[1] https://en.wikipedia.org/wiki/Dense_plasma_focus

[2] https://spectrum.ieee.org/startup-lppfusion-embraces-instabi...