Chelsea could indeed be quite a lethal team this season if they continue to improve and avoid making fatal mistakes in the Premier League and the Champions League.
Chelsea deserved a win in that game by all means. it was a better decision from the VAR and a good one from the referee as he paid attention to every detail of the game. Fulham's #30 could’ve avoided spreading out his arms that wide in a game, inside the penalty box. Some say it was an unjust conclusion on the referee's part; others say the VAR stood by Chelsea and made sure they claimed the 3 points.
Looking back at the challenge, you'll realize it wasn't a fair one since the other player stepped on someone else feet, and that was a clear callback. It's only painful to see such a thing happen after a goal has been scored, but that's why we have the video assistant referees.