I believe the planning site lists Appeal Decision as "not available" when there has not been an appeal. And the "Appeal Status" is the same as the "Status" which is "Deposited".

So my reading is that this application has been deposited with the council but not decided.

It seems odd that it would sit in that state for so long. On the "Important Dates" page it suggests the application may have expired.

The case officer is listed as Steve Isaacson - have you tried emailing or calling him? first.lastname@lewisham.gov.uk or planning@lewisham.gov.uk.