Yes, this means that the botmatch scores are also much more unreliable than the flyby scores. In other words, whenever using botmatch scores, make sure you take a few runs. And whenever looking at them, expect that the benchmarker did not, and so the scores can vary by a few fps and still be within the statistical error of the benchmark.
The flyby scores appear to be highly repeatable by contrast, and make an excellent video card benchmark (whereas the botmatch benches make for more of a CPU benchmark).
"Physics is like sex. Sure, it may give some practical results, but that's not why we do it." - Richard P. Feynman