At the end of the discussion section, there is some evidence presented that this self-healing effect occurs under neutron irradiation as well, though the exact implications for fast reactor materials seem unclear.

Makes sense, the basic mechanism seems to be mediated by increased interstitial diffusion. Shouldn’t really matter if it’s protons or neutrons that are generating those interstitials

Edit: on re-reading, it doesn’t seem that they’ve actually performed any neutron irradiation experiments