It didn't specify how much exercise they should get. Technically its right. If the dogs gets the exercise and stimulation that the particular dog needs, it will be fine in a small house. Give the border collie the stimulation it requires, and it will live fine in the small house. Its just a matter of each dog's individual requirements.
As for bil-jac, I never understood why people are so hell-bent on feeding corn to their dogs. I probably never will. What makes this such a great food?