There is a real possibility this guy is a con artist. But there is another possibility which is perhaps more likely. And definitely more frightening. He really believes what he is saying and really is that confused and/or ignorant. I have met several of these in my life.
As Arthur Clark said, "Any sufficiently advanced technology seems like magic.", and for many people on this planet technology reached that point long before Newton and Leibnitz had their little snit.
I have studied a few people like this, just because I find humans fascinating and want to understand what makes them 'tick'.
Some might be out-and-out con artists, and some really do believe, but often it is more complicated.
In my experience, a common sequence of events is as follows. A person without scientific education, but who is nonetheless very clever in a 'hands-on' sense genuinely believes that they have invented something new that provides free energy. In best faith, they spend a great deal of time 'developing' it and promoting it, frequently 'almost perfecting' it with great confidence that it can be made to work, with just a bit more fine tuning and development. In other cases, the measurement methods may be flawed but the person genuinely believes that it works, and produces 'free energy'. The details don't matter. In this initial phase, they genuinely believe it works, or can be made to work, and they promote their invention, and attract funding for further development. In their own way, they become 'famous' attracting publicity, and money. In time, it starts to become clear that the invention does not actually work. However, human nature, pride and self-deception are stronger that factual evidence. Once a person has fame, publicity and funding, it's very difficult to give that up. Some people continue to genuinely believe. In other cases, self-deception takes over, where the person deceives himself that the invention is valid even though the evidence is to the contrary, fed by the addiction of fame, publicity and money. In some other cases, the person comes to realize full well that the invention does not work, but deliberately and dishonestly continues to pretend that it does, to continue the addictive publicity and money.
One can tell where people are at in the above, by noting their enthusiasm or reluctance to have the invention independently evaluated.