As anticipated, the report clarifies that this WAS an illegal flight. At the very least it was an illegal private flight by Ibbotson. It is also clear that the flight cannot have been operated legally as a charter, even though we shall have to wait to see if - as seems likely - and to what extent this was an illegal charter by an uncertified operator using a private pilot.
I'm not sure there will be a definitive cause established for the accident itself. But if by lifting the lid on this sordid arrangement the cowboy operators get their wings clipped, that will be a significant contribution to flight safety.