This graph has been created by someone advocating a particular kind of treatment. I looked at the intermediate graph. How does it manage to use facts to advocate preferences? It's pretty simple, really. First, you decide how to group the data. You do this even though you may know that the data being grouped does not correspond across types of treatment. Then you decide how to present the data. The use of the ellipses helps to emphasize the positive presentation of the preferred treatment.
Bear in mind that this is just the opinion of one non-clinical observer. It does not mean that the data presented is not useful and I may be completely overlooking meaningful reasons why this portrayal might be appropriate.