Here is how Rossi has fooled the bunch of physicist this time:

He has given them the thick insulated cables to measure with a
"clamp ammeters". This type of measurement uses magnetic field created by the current flowing trough a wire. The calculation of the current has an assumption of a single, non-wound and non-shielded wire. However, internal structure of the cables used in this setup were not exposed. It can be seen that they are thick enough to hide things like shielding, winding, or even ferrite rings that could completely distort the magnetic fields and so the validity of the measurement.
It looks like while focusing a lot on temperature measurement, they got fooled by simple electric measurement distortion. Cables are definitely thick enough to deliver
several kW of power while apparent "measured" current would be much less if magnetic field that is being measured is partly shielded. Input power underestimated — "unexplained energy" appears... Rossi did it again!