I'm wondering the same thing. Also MHD is not a simulcast too. This HD extra pack is such BS to begin with. We now have Food-HD, HGTV-HD, MHD and Discovery HD Theater that are not simulcasts but are not included in the HD Extra pack. Maybe a new "HD Extra, Extra Package" is coming.
HGTV-HD and FOOD-HD are not in the HD Extra Pack (Why, I don't know), but Discovery HD Theater and MHD are both in the HD Extra Package.