Overunity doesn't exist. 
Overunity applies to the idea of a closed system putting out more than what goes in.

You can only pour out as much water from a glass as you fill the glass with first.
Simple concept.
You can only drain a battery with as much energy as you charged it with first.

... but... if you are standing outside during a rainstorm while pouring out the glass of water... then the surrounding atmosphere can contribute more to the glass that what YOU put in.

But now... you have to account for the surrounding environment supplying input as an Open System.
And in an open system, there is a proportional amount of energy going in and coming out still. So overunity doesn't apply to open systems.

But if you aren't aware the environment is contributing to the output... then you will make up fantasies about a closed system putting out more than what goes in and nonsense about overunity.

The SEG never claimed to put out more than what goes in. Only claimed that the unit extracts/ steals energy from the environment around it.
The energy must come from somewhere. Something must lower in order to generate an electric current.

But in this case... what lowers is the surrounding temperature. (heat and temperature are 2 different things)
It's not a flow of heat like the carnot cycle. It's dealing with the internal kinetic energy of "electrons" as a media itself.
Like how a hydroelectric dam has water media flowing through it.

The SEG has an electron media flowing through it.
Asymmetrically absorbed in 3 dimensions and output in 2 dimensions at the equator in a ring.
Restricting an entire orthagonal axis worth of kinetic energy to flow in 2 dimensions, radially.
Creating massive pressure and exotic effects.
Supplied by the environment!