Or perhaps, being Italian (or Greek, in the case of Stremenos) themselves, they have a better knowledge of the facts of Rossi's "criminal acts" than either you or I, and have decided that they aren't relevant.
But the RATIONAL (unlike psychoskeptic logic) thing is simply that Rossi's achievement is real. For it to "be a scam" would require Rossi to have suborned several hundred people (all the participants in the demos, all the folks associated with Defkalion, the principles of Ampenergo, and heaven only knows how many more.....and that all those people have managed to keep the scam secret all this time).
Sorry....that notion is simply nuts.
In Kevmos’s words, all the demos were non-scientific and crappy. Most of the observers were passive and the ones who weren’t mostly have turned up on Rossi’s payroll, thus with a major conflict of interest. Defkalion is an unknown company without a history. Ampenergo is an unknown company with a neglected Wordpress template for a website.