Just for clarification . . . the site you mentioned is defunct, but others may be in the wings.
There is no such thing as a 'Load Factor' until AFTER the flight has departed - it represents the number of seats sold over the seat capacity, expressed as a percentage.
The figures you mention are a list of availability by class, not seats sold. Normally airline availabilty figures include any overbooking profile that the respective Yield Management people care to place on the particulr flight, based on their professional wisdom and past performance.
Whilst airlines can look at the number of seats sold on a particular flight, the normal listings represent 'seats available' - which effectively are up for sale!
Per Ardua ad Astra! ........ Honi Soit Qui Mal y Pense!