For example, suppose it's game 12 of the Carlsen-Caruana match last year. Caruana has white, and he wants to win before the tiebreaks. Now if instead of Caruana playing white, Stockfish were playing, one can practically guarantee that Stockfish will win the game. Therefore, in principle, Caruana can also win the game, regardless of what opening line Carlsen chooses.
So Caruana can pick an opening by inputting what Carlsen is likely to play to Stockfish. For example, suppose Stockfish plays 1.d4 and Carlsen is likely to respond with 1...Nf6. Caruana can give that to Stockfish and see what Stockfish comes up with. Regardless of what line Carlsen chooses, Stockfish should be able to reach a line that has winning chances. In the same way, this technique would beat well-known drawing lines such as the Petroff or the Berlin. This technique would even work to achieve a win with black, since Stockfish is also very likely to beat Carlsen with black.
Questions: does this scheme work? If so, do human GMs already use it? If so, why aren't GMs aiming to win with black as well as with white?