I'm not saying Liverpool can't play well without Salah, but with Salah, Liverpool will certainly be better able to maximize their attack patterns. Salah is an icon for Liverpool so far, so when the team plays without his presence there is something different.
The strength of Liverpool's attack line will not be completely good without Salah, especially in tough matches Salah is really needed. I know Nunez, Diaz and Gakpo can play well, but Salah is a player who can bring a lot of change to Liverpool's attacking game.
With Salah's absence, Liverpool has still not lost a game. There is a hot player and finisher for the club that is filling well into the shoes of Salah, Diogo Jota who has scored goals for Liverpool. He is fast and very good on the ball, his goal scoring ability may be the advantage for Liverpool because even when he does not play a full game, he can come in, play a few minutes and still deliver the results expected from him. On the other side, Chelsea are also now scoring with the chances they create, so there is much chance that Liverpool goalkeeper will also be tested a lot.
It's good that kloop has back up for his replacement because like you said Mohammed Salah is one player that any club would not love missing in their club and I know Liverpool will also think so. Manchester city were currently suffering from Kevin de byrune absence and we all saw it was hard for them to meet up with winning games everyday. I don't how they will manage if jota turn to cease his form and I just hope jota will continue to fill his space till he is back so that they will be deeply active in the title.