The thing is most people don;t go looking for the missing pieces once they go missing. Then its easy for the disinfo agents to point at these rare saved pieces and just discount them or spin the data. They can alter the data and cause it to resurface while claiming that, that is the original data, Then it comes down to one sites word against the other and the confusion and fragmentation occurs. Lots you can do to create confusion after the fact. There is much of this going on in other areas of the Conspiracy "world."
Most people are not following closely enough for them to be able to go.."ya I remember that was how the data was originally reported." A very small minority may remember it in its original form.
Perception is reality and perception is being played with by TPTB.