(As an aside, it's probably just my lack of familiarity, but considering how simple the algorithm is I find the syntax surprisingly hard to follow. Is this modern C++?)
Additionally, a generator that passes those 200 tests is not guaranteed to be high-quality for a particular usage, which might as well be considered nothing but another statistical test. There is the famous case of the r250 generator---an additive Fibonacci generator that passed all statistical tests of the time---which turned out to have characteristics that rendered costly real-world simulations wrong [1].
That is C++, yes, but I don't think there is much of anything modern about it. Trying to save on space probably contributed to its unreadability a bit.
[1] http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.69....