I didn't read the whole article, but from the schematics it looks like they are exploiting thermal electronic noise and applying a half-bridge rectifier to it so it produces very low voltage power.

On one hand, it's clearly bullshit due to the extravagant title claiming to violate the 2nd law of thermodynamics. On the other hand, if a system is sufficiently small than it can violate the 2nd law, locally. It seems the tour de force in this case is that the scale can be somewhat enlarged by the very low power of thermal electronic noise.