That's probably a link to the spot for Yuma's SD channels on 110W. I think you are correct that the Yuma HD channels are missing from The List! I'm assuming Yuma has HD locals.
Here's how I obtained the map. Select The List! from under Our Other Sites at the Sat Guys menu at the top of the page. Select Subscription List. Select Dish Network 110.0W. I did a Ctr F search for Yuma but you could simply scroll down to find a Yuma local. I then clicked on the spot beam number for the Yuma local to get the spot beam map. If you click on Yuma, you'll get nothing and like it!