How do you fake that much heat? Really?
You measure it with tools you supply and only you interpret the measured data.
None of these guys thought to bring their own thermometer. Jed Rothwell was invited to a Rossi demo, and when Rossi saw that he was going to bring his own tools he uninvited Jed. I find it incredible that over these last 8 years not one of these guys brought their own thermometer to the party.
Celani brought a Geiger counter and got roundly scolded by Rossi when Gammas were present, because that would quickly have pointed to which reaction was taking place. Someone thought to bring a Geiger counter, but not a thermometer. It just defies gravity in terms of common sense.