Indeed. The passage is from near the beginning of Volume 2 (Chapter 3), where he says how he came up with something that seemed like it should be "super random"

Indeed. The passage is from near the beginning of Volume 2 (Chapter 3), where he says how he came up with something that seemed like it should be "super random", tried it, and found that it was not. It ends with: > The moral of this story is that random numbers should not be generated with a method chosen at random. Some theory should be used. and the rest of the chapter proceeds to give some relevant theory.