Look at all the programming language implementations that provide big integers by calling out to GMP. Why would it be "cheating" when available to all and done openly? Libraries matter.
>Most the Debian benchmarks for C# are cheaty too.<
In any case, because the charts are frequently cut & pasted out-of-context they should not include pi-digits and regex-redux data. Now they don't, so thank you.
If you don't think it's appropriate to compare the pi-digits and regex-redux programs, simply ignore them and compare the other 8!