It is the power of coding. The Warden only detects known implementations of third party programs. If you can do something that is unique and isn't read by Warden, you can most certianly get away with it.
Hell, I ran D2Loader and MH 4.7j on the D2Maniacs Zy-el Server and I never got busted, mostly because the bot was decomissioned. And now the server

.