I do not even understand what it is that you think Carlsen cannot do. But every master can do it for one position at a time. Then he just analyses a number of p

I do not even understand what it is that you think Carlsen cannot do. But every master can do it for one position at a time. Then he just analyses a number of positions, from Niemann's games and reaches a conclusion. You did not describe the algorithm or the data which would help writing the software you are talking about. As I said, for me if this software would be based on comparing the engine's best move with the human's move and give such metrics as average centipawn loss, it would not be nearly adequate for this purpose. And I insist that all the things you described as the hardest part are only poor substitutes for understanding the game of chess.