Do they sell dim sum items at this one? (i.e. buns, dumplings, etc.)

Yes they do, in the freezer

Unfortunately they do not have a food court counter service here as they do at the other stores. I really wish they did because I go there more often myself! They only have Frozen items

I am sorry to say i am not certain since i never put foot in that establishment. But if they have a number you could call them.