Yeah in experiment if we used his equations the overall energy and effects within an area would be different from those that are achieved in an experimental situation because the relations between the energy and momentum of particles would not be produced by that simplified maths alone, what he has done is gloss over the actual situation. Although what he is saying is pretty much the same thing anyway, he just doesn’t have the equations in place to provide the results we actually see.
There’s no way we are going to get into the partial differential equations here though and have anyone understand them, suffice to say the rates of change in any given volume of any mass particles are equal to the partial equations we now use. Without them we have a very simple idea that James gives, and that is insufficient. It’s hence not really explaining anything more than a superficial idea of gravitational energy and its effect. It’s hence a simple face value equation that is derived from itself, it cannot be verified.
The fact is Einstein didn’t arrive at something out of the blue it took years of playing with calculus, years of adjusting formula to get something that would agree with the experiment. At face value all James is saying is that if this happens this will happen but there’s no maths there which would actually substantiate it or which we could verify. It’s Einstein when the idea first popped into his head, there’s nothing here that will provide experimental results. James needs to formulate something that could be verified quantitatively, he does not. No model = no experiment = no peer review = no science.