If he hid 1.5 MWh within the materials, then it is an impressive invention regardless of if it is cold fusion.
If he manipulated the sensors to show a higher energy output then was actually the case, it is considerably less impressive.
If he manipulated the sensors to show a higher energy output then was actually the case, it is considerably less impressive.
If Rossi has found a way to hide that much energy in his rod and/or materials, then let's just go with that and skip researching all the fusion stuff.