In addition to the decline in performance, Pep's strategy can actually be read perfectly by Arni Slot. He understands very well how Pep implements the strategy, especially on 1st half. As we can see how the 1st goal created, Mohammed Salah was unguarded at the moment, even Salah is a top scorer but he is not separated from the defender's observation. It's the same on 2nd goal, the city defender repeats the same thing, Salah, and Szoboszlai still missed their surveillance, and create a nice collaboration on front for 2nd goal. That strange strategy Arni implemented 4-2-2-2, this making mess The city player when Luiz Diaz, and Jones looming them on the other side.
I completely agree with you. Arne Slot understood Guardiola's match strategy very well. That's why it was quite easy for Liverpool to win this match.
It cannot be denied that Manchester City tried to dominate their home match. But at the end of the day, although Liverpool managed to score two goals, Manchester City could not score a single goal.

If we look at the match statistics, we can understand that Manchester City dominated the match. Manchester City had 66% ball possession and had 16 shots. On the other hand, Liverpool players had 8 shots.