(It's also available via AM SW broadcast on 2.5, 5, 10, 15, and 20 megahertz.)
The standard 3740 diskette held 241kiB of data and was very slow. We've come a long way since then.
The summary says the star tracker didn't work in "an area of low magnetic flux" (the South Atlantic Anomaly). The true issue is that the SAA is a high radiation area and the radiation caused an SEU in the star tracker. The Scientific American article was a bit mixed up about dumping the momentum stored in the reaction wheels. The text is a bit jumbled, but I believe the article was referring to magnetic torque rods which produce a force vs. Earth's magnetic field, but they only work if the spacecraft is stable. The spacecraft was never stable because the IRU (gyroscopes) provided erroneous information. In the end, the ACS issue (probably a sign error) is what killed the spacecraft.
Nobody is denying that the records are being modified. The only contested issue is whether or not the modifications are correct or justified.
Here is a timely article explaining the fallacy of modifying scientific source data.