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Rossi stated that they ignored the energy, not the actual temperature values
Again you are jumping to conclusions.
Edit to add: if they hadn't ignored that extra energy, COP would have been higher. Which is why it is conservative. I don't see how there is any argument against that.
As long as Rossi by himself will confirm my "conclusions", like it happened before, I can't see any problems with that.
P.S.
Maybe you have been deceived by the term "... to be conservative".
If they hadn't ignored the energy above the boiling point (the energy which was needed to produce the real quality of steam) then the COP would have been LOWER.