Fastestlaps.com is publishing best results from multiple sources. You cannot look at all the acceleration data and plot it on a graph - it will be inconsistent, as you can see.
The graphs use average and interpolated data, therefore they are correct and continuous (at least in 99% of cases)
All data is factual, no "imagination" involved. Only data that is not result of physical experiments is data marked as "est" - which means estimate.