AI has always been skinny and since he's older now and not working out, he's going to lose muscle mass.
Anyways going back to the picture....it's a little bit distorted and the pics are are shrinked. The width is shrinked and the length seemed to be pulled, making it a little elongated and it puts emphasis on his thin body.
You can tell it's distorted because the other players look weird too.
Just not as skinny as those distorted/angle as the pics in the OP.
It's like those magazine pictures of players, they have them in angles where it makes their head look above the rim or their legs seem to be 5 feet off the ground.
He's skinny, obviously, he's always been. He was around 160 in his hey day. he looks 150ish here perhaps even less. You can easily tell he lost a lot of muscle mass.
Those pictures are not distorted either otherwise everyone else would look elongated as well but they don't. Look at Rafer's arms compared to AI. Rafer has always been a bit skinny as well but Rafer looks to have kept his body in shape while Iverson allowed himself to wither away. Not enough macro nutrients and lot's of physical activity will do that.