He lost his arm before the filming of the Swan Orientation Film. If this is true it would suggest that the psychological experiment that the occupants of the Pearl were observing was not people entering the Numbers into the computer but in fact watching them use the Swan for its original purpose.
In the video, it is claimed that the Pearl station functions as a monitor for the experiments in another station. This could be -
formerly factual - it was an experiment, but after the Incident is no longer just an experiment
false - The Pearl itself is also an experiment, and they don't want the subjects to know it, hence the video camera in the station, and the admonition to record all details, "no matter how minute"; also the Numbers in the Swan may actually be significant.
But if they are significant, why do they put the notebooks in a dump ?
The 1980 copyright date may be a false date
The garbled static in the tape may be a result of: 1) the tape's age, 2) the tape's overuse, 3) electromagnetic damage related to DHARMA projects, 4) an intentionally removed splice of missing tape
The Pearl could have originally been monitoring the Flame station. There is no direct evidence from the video that the station originally monitored the Swan other than an image of the computer room in the background as Wickmund speaks. However, the feed seen in "The Cost of Living" shows that at least one other station has a computer room similar to the Swan. Thus, this could be the station the Pearl inhabitants originally watched. After the incident, however, emphasis could have changed to also cover the Swan due to its now huge importance (i.e. the imperative button procedure).
Marvin Candle is not in the Swan, but in a mockup of it. Anyone who has seen Oceans 11 might understand this a little more.