Paul
Im afraid it is black and white with a lot of grey in between, for some not having a F2F places them at a disadvantage, for others it is a plus.
Make sure you send any updated information to the DWP as quickly as possible, I would make it clear that you intended to provide the information to the assessor had your F2F not been cancelled.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems