that thread pertains to haidong gumdo, which is significantly different from kumdo or kendo.
kumdo and kendo are the same. the only variations you'll find are the variations you'd find between all schools. every master teaches and interprets differently. the people keep promoting that there is a difference are the ones who are looking to create a greater rift between korea and japan.
for more info i'd suggest you go to http://www.kingdomfighter.com
and ask the folks over there.