Do I put the ribs (and liquid) in the pan and seal the pan tightly with foil, or wrap the actual ribs and put them in the pan?

I have a question about step 4 on the recipe "Seriously Delicious Ribs" from Jennifer Perillo. It says:

"Remove ribs from the refrigerator. Pour braising liquid over ribs, wrap tightly with heavy-duty foil and place in oven, side by side if possible. Cook for 2 ½ half hours. Alternate pans halfway through if cooking on separate racks in oven."