If you're talking about Celani's report at a 2011 Rossi demo, it was anecdotal and just as worthless and useless as Mizuno's water bucket anecdote.
It was anecdotal, which is why Celani said "who knows?" when I asked him what to make of it. Mizuno's heat after death, on the other hand, was recorded on a pen recorder, described in detail in several reports and a book, witnessed by his co-author, and replicated hundreds of times. That's not "anecdotal." That's the opposite of an anecdote.
But anyway, you should tell us how Rossi triggered the event witnessed by Celani. What sleight of hand trick did he use? Assuming Celani was not lying, it must have happened. It is not likely he made a mistake reading two different meters. Since it was a single isolated event (unlike Mizuno's HAD it was not reproduced hundreds of times) we cannot draw any conclusions, but it was probably a real physical event.
"Anecdotal" is not a curse word. It does not mean "unscientific" or "worthless" or "should be ignored." Anecdotal events have often led to important scientific and technological breakthroughs. We should pay attention to them, and try to replicate the ones that may be important evidence of an anomaly.