The name "benchmarks game" signifies nothing more than the fact that programmers contribute programs that compete (but try to remain comparable) for fun not money.
The performance of those programs with CPython explains the existence of numpy, and if you look you'll find that numpy programs are shown.
The comparisons they do is not of idiomatic code... for example in python they do a lot of array programming and don't use numpy (http://www.numpy.org/). So for most languages the results in there are completely meaningless.