I believe that was Defkalion, but perhaps I remember it incorrectly.
It was definitely Rossi. Check your email if you want to confirm it. Defkalion gave me a bogus invitation to test them. When I sent a senior Canadian professor to schedule something, they evaded him -- no response to voice mails and never in the office. Of course, we now know they were crooks and nothing else. Far as I know, you were not involved with that. And the test with Rossi may have been liquid but then why would we sparge steam in a condenser? I do recall that was discussed though it's so long ago, I could be wrong.
Perhaps I am confusing you with Abd, who claimed that it is always possible to fool an observer by one method or another. That is true of some tests, but not the first one Rossi un-invited me to.
I would never make such a stupid claim. But if you can't isolate the device at least at the input and output and sufficiently to avoid surreptitious connections, then you can indeed be fooled and not realize it. I think screwing with the input is one of the methods Rossi used to cheat of the many he employed at various times. A good magician does not do the same trick twice for the same audience. They may not be as easily misdirected the second time.
BTW, if you confuse me with Abd, you are SERIOUSLY if not terminally confused!