Great pics my friend! Looks like you had a great time
The reason he does the back double bi with one arm up is to try and hide the imbalance, but doesn't matter, it's still noticeable.
Every time he used to hit a back shot you couldn't help but drop your jaw, now, its just "meh." He's still got a ton of muscle, but his symmetry is awful now, and you can't be Mr. Olympia with one side of the body far smaller than the other. Look how much his legs (especially the left) have shrunk.
His other side is still Mr O quality, if he didn't have that bad left side he would still be Mr. O. Most of us would die to have the arm and leg size of his left side, but in comparison to his right it looks awful.
Glad you had a good time and got to meet him, did he mention anything about his future plans to you?