I'm just upset that they used the same name as the well-known software project GNU Fusion, which is liable to confuse most people.

You almost got me.

> the neutrons were created through photodissociation of deuterons via exposure to 2.9+MeV gamma (energetic X-ray) beam.

Gamma rays, not neutrons

Doh, minor brainfart. Thanks, I corrected it.

I think they saw "deuterium atoms in a metal lattice" and associated that with one of the original hypotheses about cold fusion. But this fusion is anything but cold:

A metal such as erbium is “deuterated” or loaded with deuterium atoms, “deuterons,” packing the fuel a billion times denser than in magnetic confinement (tokamak) fusion reactors. In the new method, a neutron source “heats” or accelerates deuterons sufficiently such that when colliding with a neighboring deuteron it causes D-D fusion reactions.

Cosmic rays hit things at ground level at an average energy of 4 GeV, about 1/cm2/min according to this source: https://cosmic.lbl.gov/SKliewer/Cosmic_Rays/Muons.htm#:~:tex....

This is also loading up deuterium in a metal lattice, getting fusion, and wondering how to commercialize it.

Have you looked into chirped pulse amplification lasers?