In 2017, when Andrea Rossi developing the E-Cat QX (the first version of the current SKLep) he was focused intently on achieving a level of performance classified as Sigma 5. This was a determination of the reliability of the Ecat, and Sigma 5 was the highest level, and the one he needed to achieve.
Yesterday, on the Journal of Nuclear Physics, Rossi stated that the Ecat SKLep was also performing at a level of Sigma 5, and gave this explanation:
January 18, 2022 at 5:47 PM
The Sigma series measures the probability that a supposition is true.
It depends from the specific situations the concept is applied to.
Let me make the example of the supposition that a dice is tempered:
Sigma 0 : the number 6 wins after 1 throw: means nothing, the supposition has no ground
Sigma 1: the 6 wins 2 straight times: still the supposition is groundless, this event is not frequent, but can happen many times
Sigma 2: the 6 wins 3 straight times: still this can happen, although the situation can raise some eyebrow
Sigma 3: the 6 wins 4 straight times: it is not impossible, but all the eyebrows around begin to raise, although also this is not impossible
Sigma 4: the 6 wins 5 straight times: at this point the suspect becomes convinction: the dice probably is tempered
Sigma 5: the 6 wins 6 straight times: at this point it is proved that the dice is tempered, beyond any reasonable doubt.
If instead of a dice you put an extraordinary effect of some kind, to measure if it is casual ( it happens few times) or if it is a rule ( it happens always ), the mechanism of the Sigmas is the same
I think the point he is trying to make here that the extraordinary performance of the Ecat SKLep is always the same, and that it cannot be ruled out as some kind of artifact or fluke.
The thing we are now waiting for is for people outside of Leonardo to get their hands on these SKLeps and put this claim to the test.