Note...they don't tell you what else they were eating with that high protein diet or what constitutes "high" for that matter. Was it also high in processed foods and sugars? How about transfats and vegetable oils?
To single out protein as the causative factor in this case without also considering the rest of the women's diets is irresponsible IMO.
Come to think of it, if a high protein and fat diet causes high rates of non-hodgkins lymphoma, I wonder why the Inuits didn't suffer widely from it?