I disagree. Our form wasn't a mirage - it demonstrated the clear improvement under Conte after a few months of coaching.Terrible match and the players showed the recent form was just a mirage, this is still not a serious team. Brighton played it perfectly and made the game boring, wasted time and made sure that only our CBs had time on the ball.
Players like Reguilon and Emerson cannot do anything.
The problem is that we lack the quality in the squad in terms of starting XI (wing backs, etc) and depth to grind out results like that consistently and not shit the bed unexpectedly like today.
Edit: perhaps I do agree to a certain extent over the 'still not a serious team' part but the good results have been deserved.