He knew everyone involved in the process of obfuscation and discovery, including the person who wrote the linked article, Master John Hancock. When it comes to this matter, if you really want to get into the gory details, contact him.
I know John Hancock. I was the one who he learned that GM HWANG Kee was a member of the Chung Do Kwan and whose rank was 6th guep, White Belt. This was ten or fifteen years ago. He kind of went to town after that and tried unsuccessfully to get the Soo Bahk Do Hwe to admit the "truth". At the time it was radical information, but today, everyone sort of accepts it, the Moo Duk Kwan/Chung Do Kwan connection. You can tell there is a connection simply by looking at the logos of the respective Kwan. The Moo Duk Kwan symbol is derivative of the Chung Do Kwan symbol.