All of this depends on being able to push hydrogen atoms to achieve a state lower than the currently known ground state.
With the abundance of hydrogen in the universe, one would think we would have seen these hydrinos in the wild... but alas, we have not.
Which calls into question the assumptions that they can be made to exist.
Bingo.
Article claims this "new, more stable form of Hydrogen", but fails to give us any chemical description thereof, and the universe fails to produce it despite its propensity to seek lowest-energy-levels of pretty much everything. A quick search turns up descriptions of it, claiming hydrogen atoms "shrink" when banged against other atoms and transfer energy. Between the simplicity of the alleged process vs. the universe's lack of "hydrinos" one must conclude the theory is flawed on its face. Descriptions also follow the exciting results with a series of caveats which gloss over the math not adding up; if it does happen, there's not enough to cover the energy cost of splitting water in the first place (a required first step) in hopes that a rare "hydrino" may occur.
And with that...
Let's review the Three Laws Of Thermodynamics:
1. You can't win (and this guy is claiming a "win").
2. You can't break even (perpetual motion doesn't happen).
3. You can't get out of the game (can't isolate a system 100%)