He doesn’t have to deal with physics if it is a fraud.
If it is a fraud, it will become clear soon enough. And since he seems to be saying nobody should give him money until he delivers, it seems that the only people who could be “defrauded” would be people who don’t take his advice. Pretty odd fraud.
Absent attempts to steal money from people, at worst he’s just stringing us along in an elaborate april fool’s hoax. I certainly am not making plans for my future based on his device, so if it turns out his device doesn’t work, it won’t bother me a bit, and if it DOES work, it will be cool.