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.
In this case, I disagree with Kevmo. The first three were quite well done, and sufficient for proof.