Liverpool played well in matches without Salah and Manchester City played well without Kevin months before. The return of Kevin is helpful for Manchester City and it comes at times when Salah was absent in Liverpool. Anyway, Liverpool are still leading Premier League and hope that they will continue it.
Beyond Salah, they have two other injuries from Jota and Arnold who are both important players in their club. They must go through this hard time before these players return to their squad and it's very important as Premier League is going to last matches in the season. Any mistake now will possibly pay a high cost as Manchester City can take advantage of it and never give any chance for Liverpool to get a first position back.
Even when Salah is not around the difference is clear and you can easily know whether he's around or not it will be easy for you to tell, and If Salah is not around for long it will affect Liverpool's performance very well, players like Salah and Kevin are very important, and even Manchester city's last match Kevin was not available due to a slight injury, and even if Manchester city won if Kevin was around there will be a difference.
And the way Liverpool is so determined to win the Premier League and they are doing the best they can, and the way things are going we might have a new defending champion this season, and i will love it, it can not be Manchester City always. if any key player should go on injuries then it will become a 50/50 chance in any game they play and that is how it is, in the case of all these players Kevin and Salah.