Bonds is technically not a plaintiff in this action. It is an action to prevent the leaking of grand jury testimony. If Bonds were to actually sue the publishers, then the publishers could force his deposition. The last thing Bonds wants is to be put under oath, so I don't expect he will personally attempt to sue for libel.
This is not a suit to stop the publishers from printing falsehoods, but is an action to stop them from publishing the truth.