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pesn.com is somewhat legit, a lot of the members though aren’t professors and European they don’t come out often and slam directly.

They tend to put inconvenient facts on their web site that makes you make up your own mind that it is a fraud rather than outright declaring it themselves.

That site is where they reported their frustration of not being able to get radiation readings from the experiment. That is a glaring red warning sign on the legitimacy of any cold fusion experiment.

My theory is, they want to get absolute irrefutable proof it is a fraud so they play nice trying to get better access.

Please google Widom-Larsen. These two scientists have brought forth a theory that explains the physics of Andrea Rossi's Energy Catalyzer.

Here is a high level description of the theory from a NASA conference on Aviation Unleashed NASA Aviation Unleashed

Widom Larsen Theory Overview

p + e* -> n + e* Inhibited by 0.78MeV
e* is a “heavy electron” allowed by QED -requires high electric fields (~1011V/m or 10V/Å)
High fields result from a breakdown of the Born-Oppenheimer Approximation via a coupling of Surface Plasmon Polaritons to a collective proton resonance in the metal hydride.
The result is an Ultra Low Momentum Neutron which is rapidly absorbed by nearby nuclei.
Subsequent decays release significant energy.
Select impurities/catalysts determine the overall energetics

Lets convert this to English a non-physics person would understand.

When Hydrogen is "charged" into a metal like Nickel, the electron joins the electron sea, and the proton (Hydrogen nucleus) separate. When one of these free electrons has enough energy, there is a chance that one of the free protons will capture the electron and form a neutron.

Because of the conditions at the time of the creation of the neutron, it has almost no kinetic energy. Because it has very low energy, it is absorbed by one of the local atoms

So one of the Nickel atoms grabs the neutron, and the new isotope of Nickel may be unstable

This table shows nickel capturing one neutron

58 Ni -> 59 Co (cobalt)
60 Ni -> 61 Ni
61 Ni -> 62 Ni
62 Ni -> 63 Cu (copper)
64 Ni -> 65 Cu (copper)

The current state of the art is like the understanding of magnetism was 300 years ago. You needed a lodestone to make a magnet. Now we understand how to turn electricity into magnetism. Once the theory catches up with the experiments, we will learn how to reliably recreate the conditions that allow the electron capture that creates the ultra low energy neutrons