Frankly, I don't believe Osama said he was sorry and I think this apology is specious.
If Osama wants to apologize (which is incomprehensible, considering what he did), and wants people like me to actually believe he is sorry, let him do it himself. Otherwise he always can/will say that his son made it up.
And maybe, just maybe, that's what happened.
I am more inclined to think that such an apology indicates a rapid decline in Osama's failing health inspiring his son to invent an apology, rather than Osama experiencing a change of heart. His son is probably hoping to get him into a hospital.
"You can never cross the ocean until you have the courage to lose sight of the shore." - - - C. Columbus