Dr. Kimm He-Young (founder of Han Mu Do) was also involved in KSW. He has written numerous books on Hapkido, although I cannot vouch for their quality or validity.
I have to wonder how much of KSW's history is puffery.
At least Chayon-Ryu founder Kim Soo accepts the fact that the Japanese occupation of Korea did all kinds of damage to the lineage of the Korean arts. I'd buy the whole KSW story if they would admit that it is a reconstruction and that it is not perfect.
The testing fees and required purchases in KSW are really out of hand.
I know it's been over three years but I couldn't view the article in your OP. If you could re-post I will burn my dobok in your honor. :D (I still have two!)