It is a benchmark comparing what type of data structure are easier to use in the two languages. Of course it is entirely subjective (the author argues for how

It is a benchmark comparing what type of data structure are easier to use in the two languages. Of course it is entirely subjective (the author argues for how that is due to a static vs dynamic ownership model) and there is a single data point, which is the author rewriting the code. (two is you consider when he/she swaps one of the data structure)