Also, his comment I just quoted above, that recombination might be caused by something "unusual" and therefore it might not be detected shows that he knows nothing about electrochemistry, he has no grasp of how experiments are done, and he has no common sense.
You have made this claim - stating I believe that unexpected chemical catalytic reactions in a Pd electrode (unknown mechamism - do not always occur) are impossible.
I don't see how you can prove that. When you are also stating that unexpected nuclear reactions (unknown mechanism, do not always occur) are possible.
Surely you can see the similarity of the negative arguments?