Isn't the point comparing traditional heuristic techniques against DNN-learned techniques? I understand the latest Stockfish is etching quite close to AlphaZero techniques, but maybe I am wrong.
It does have the option to use a neural network (nnue) in its evaluation, but it is very different from what AlphaZero/Lc0 do. You can choose not to use it, so you still could have a "traditional" evaluation (which would still blow Stockfish 8 out of the water). Also, Stockfish 8 isn't the last version before they merged nnue ...