Meaning that had the computer been playing, it would have calculated a combination to get out of that particular mess.
This is just complete nonsense. Please stop misleading people.
What really happens is that those labels ("inaccuracy" and "mistake" and "blunder") can't be trusted. Look at the real engine evaluation (switch to the "Analysis" tab), and look at that. Stockfish says that fxe4 is -5, while Nxe4 is -11. So yeah, a huge blunder.
Check out this #chess game: nate6837 vs erraticarchitect - https://www.chess.com/daily/game/496607243
He clearly blunders after taking with his knight, opening his hanging queen up to an absolute pin. But the engine does not agree with this, even though in the game review it even acknowledges that he is losing a queen this way.
Can anyone explain to me how the engine reaches these conclusions?