of 'science' posted without reference. The site is a mix of a limited set of study references with interpretations done in a way that make it not clear which is which at times. For example the site says:
Research states that the transition of the swing is where additional elastic energy is stored within the body. This is a result of the lower body moving forward and the upper body still coiling backward.
This statement does not have a reference. Is it from a study or the authors opinion?
Beyond that you need to be specific about where you think the site says something that conflicts with something I've said. I have little patience for digging through pseudo-science.