Oops, the site is wrong. I have one, and it works fine.
For the sake of someone who might find this in a search, here is some information on the FRP Offroad Fork Damper Tool (Jeff Fredette). I have one of the tools, and one end is for 1995 - 2006 KDX200 (KDX 200) and 1997 - 2005 KDX220R (KDX220 KDX 220). The other end is for 1986 - 1992 KDX200. It won't work for the USD (up side down, upsdie down) KDX200 or KDX250 (KDX 250) forks. I don't know if it will work on KDX50, KDX175, 1983 - 1985 KDX200, 1980 - 1984 KDX250, KDX400, KDX420 or KDX450 forks.