Costs are difficult to work out - it depends on cloud vs. self-hosting, what kind of TPUs/GPUs, how long you're calculating over.
The advantage that classical/NNUE engines have is that they can more easily spread over distributed frameworks like Fishtest.
Agreed, this looks superficially like commentary on the game, but honestly it doesn't seem more pertinent to the game score than a Markov chain trained on all the commentary would be (presumably this isn't true, and the author started with something like that Markov chain and the current version is way better in terms of some fitness function).
I wonder if there just is not enough training data available. GPT-3 overcomes this by harvesting a ridiculous amount of training data. AlphaZero, and the chess engine here, which is excellent, overcome it by generating their own training data through self play. But that's not applicable to the task of generating commentary.
how much does a game cost in CPU time money?
How do I get the commentary for a game I played? Oh, it's in Analysis page.
It plays chess very well, but the commentary is incoherent and doesn't match the game well -- The attacks described are nonsense and the coordinates are wrong. It seems a little confused about which side is which? It thinks a rook can diagonally attack a bishop, and seems to name squares opposite from their actual name.