Well, obviously the guy is faking it
The only way this conclusion can be reached is after blood levels of the medications is obtained. Did Fox take his meds at the properly prescribed levels and at the correct times?
For a man his age, without a doubt, his symptoms suggest that either he has a very aggressive form of the disease, or his disease state is not well managed by his physician, assuming that Fox is following the directions of his MD and his pharmacist.
By the way, Fox's conclusions about the usefulness of stem cell therapy for management of his disease are questionable.