2/10 would not recommend for technical merit.

8/10 is nice if you want a handwavy human explanation of some rudimentary expectations in crypto

- author spends a few pages thinking about randomness - we have formal definitions of a RNG/PRNG.

- author does basic statistical tests, these seem very unconcerned with actual randomness - i'm not sure what the point is

- author really shouldn't be writing about crypto randomness if they don't do crypto

+1 to higher comment saying reading TAOCP instead.