I watched a few of his videos. It's mostly a guy talking. The Perma cube is represented in computer graphics but not as an actual artifact. This leads me to believe that it's simply a concept in his head. I did a Google search looking for Perma Cube reviews and came up with nothing.
There's an old guy from Australia who does videos concerning his aquaponics set up. The
video show real plants in real green houses with real fish in real tanks. Then he eats a real fish with some real vegetables. Somewhat more compelling.