It's worth noting that its pretty easy to generate data that passes all NIST random tests which is 100% predictable / pseudo random. Eg, just encrypt using AE

It's worth noting that its pretty easy to generate data that passes all NIST random tests which is 100% predictable / pseudo random. Eg, just encrypt using AES 256 with the key "predictable" hashed. So, these tests are necessary but not sufficient to prove a random walk hypothesis. The author says as much, but buries this somewhere midway down the article.