If you email the InHD press contact, they'll tell you that their programming is available to both DBS and satellite providers. They'll also tell you that they have not yet been able to reach a deal with a satellite provider, but have been in discussions. Might the terms they are asking be more acceptable to cable providers? That's entirely possible.
InHD is funded by cable operators, but lots of channels are like that. The Discovery Channel was initially funded by cable operators. The Golf Channel was funded by cable operators. TechTV will soon be owned by Comcast.