Those are not full-time channels, though (at least, not the satellite-delivered alternate channels) and Dish hardly ever uses them for anything. You might as well count all of the Sports Alt channels at the end of the RSN range, too, even though those are just part-time, game-only channels, with no guarantee of which channel number will be used for your team's game on any given day, if your team is still being carried by Dish at all.
Dish's website shows only 23 channels in Multi-Sport:
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Yes, they list Big 10, Pac 12, and SEC as collapsible channels for the Hopper, just like they do for the remaining RSN's. Otherwise, they still only list one channel number for each channel, rather than list all of the alternate channels, since there is really only one full-time channel for each network listed.