Nobody has any trouble “understanding the theory,” because there isn’t one.
***There are dozens of LENR theories, just like there are many theories of gravity (no generally accepted theory yet) and several theories of condensed matter High temp superconductivity (no generally accepted theory yet). But that doesn’t stop you from jumping on gravitational science and superconductivity threads and loudly displaying your scientific ignorance.
This is the Internet, and anyone can claim to have a PhD. I’m content to let the quality of your posts and mine serve as a guide to anyone reading these threads as to which of us is a retired condensed matter theorist, and which of us is simply a true believer in pseudo-scientific twaddle.