i think its fake. You see him on TV going to award shows or whatever and he always has a good build to him. That picture is not a good build... its sloppy and personally I think he would never let himself get to that level.
He looked a lot better than that when I saw him in Terminator 3 on July 2. That may be him in picture after he got sick and had his surgeries. If it is him he sure turned it around to make T3.
Nothing wrong with that picture to me.....one day, we will all look much worse than that, if we live long enough. What's wrong with age and sickness. Bottum line, he had much more of an impressive build in his youth than most of us have or will ever have!