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.