Of course it's a secondary hash. He's mapping buckets by a hash and a shift. This is not a new strategy, and xor, Fibonacci, and "real" hashes fall along a spec

Of course it's a secondary hash. He's mapping buckets by a hash and a shift. This is not a new strategy, and xor, Fibonacci, and "real" hashes fall along a spectrum of average vs worst case runtime tradeoffs.