The plasma electrolysis at electrode is commonly used in cold fusion research, but its energy yields aren't as high in general.
In the example given the value E_out/E_in =~ 1.3.
In a later test equipment,
this value is already quite much better, Run#1: 2.05 and in Run#3: 2.29
To me these values sound such that there is really an energy producing phenomena in these tests. If you compare these values to the values we have seen in the case of Ni-H, 1.0 - 1.1, it seems that this kind of test-system would be clearly a better direction to go. In the open test-cases related to Ni-H-systems we end up always in the discussion if there is excess energy or any at all.
Of course one thing would be necessary in further development, some kind of theory about what's happening here. Mizuno's original explanation might not be enough ?