Does Forbes actually fact check its "science" articles?
Neither hot fusion nor cold fusion are "guaranteed" to have radioactive waste products. The apparent best pathway for both right now -- if we stipulate that we believe in cold fusion for the sake of discussion -- is neutronic, so both produce radioactive decay products, and for both the decay products are very short lived compared to fission.
Sounds like they are basing it on the one real-world fusion reaction we see every day that is 93 million miles away. Plenty of X-rays come out of that reaction. Fusion in the core of that reaction does produce gamma rays, but those frequencies get slowed down before they reach the surface.