The loads you are seeing for those dates has absolutely nothing to do with their plans to put the A380 on this flight. Loads vary day by day on flights and routes. I've taken this flight many times and most of the time, it is packed across all 3 classes. But doesn't mean that it is always the case every day. Mar 20th is still far away and still a probability that within these next three months, those F seats will be filled.