Author here; thanks for the interest! First of all, you're completely right. I do actually mention this fact just before the start of the section "An experimen

Author here; thanks for the interest! First of all, you're completely right. I do actually mention this fact just before the start of the section "An experiment". Here, the argument is that the bias this odd/even mismatch introduces is orders of magnitudes smaller than what is introduced by the rounding errors; that is, a perfect theoretical RNG drawing from that range would not produce nearly as biased a result (and conversely, if you were to run the snippet in the blog post using `rng.Next(2, int.MaxValue)` or `rng.Next(0, int.MaxValue - 2)`, you wouldn't see the same bias, even though the ranges are still odd/even-biased to about the same extent).