I saw that too so I emailed them on 30th Nov inquiring about when they're next appointment was and at the time they said 19th of Jan.
I told them on the same day that I had an appointment and would take their next free slot and got 9th Jan, so still unlikely to get my report back in time for the embassy, but still four weeks sooner than it would have been if I was just asking now. They need your NVC case number, but otherwise not that much info needed to book.