This is not cold fusion folks. They're bombarding with 2.5 MeV photons. If you had a material made up of particles with that average energy it'd be 29011312515 Kelvin.
Gamma rays, not neutrons
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.
This is also loading up deuterium in a metal lattice, getting fusion, and wondering how to commercialize it.