His low testosterone levels can also be explained from a lot of other things....
I know he used steroids before. Maybe that has something to do with it?
Also alcohol and smoking lower testosterone levels. Also, a bad sex life can lower them too. So, you have to take into consideration a lot of things...
pituitary damage really isnt as novel of a finding as they present in this video, we know how to test for it and we know how to treat it (with few exceptions like everything else in medicine)