iPhone factory reset bars access to revevlation

It has been known for sometime there is no general release that can handle the deleted encrypted data on iPhone 4s onwards.  The latest article in the The Register ( http://www.theregister.co.uk/2014/05/01/thanks_for_nothing_apple_say_forensic_security_chaps/ ) rehearses discussion the forensic community has already had about deleted keys and deleted encrypted data. The factory reset point merely