The thing the guy is not publishing or explaining how it works inside because:

1) Its a scam.

2) He wants to make money out of his invention and does not want to reveal how it works.

So yeah, the guy is not publishing anything with scientific standars, nor giving information about his invention, but that does not mean automatically that its a scam.

From the videos I have seen if it is a trick its a very good trick because I have not seen where the energy could be coming from. Also, he has agreed with the greek company to not be payed a dime until they have the prototype working and he has agreed. If it is a scam and the thing does not work why would he agree to something like that?

I guess we will see if it is real or not in a few months. The prototype from the greek company should be ready by October.