Technically yeah they are still a strong team without De Bruyne too. However there is still a significant difference between a Manchester City with and without him. We can see it clearly from how much more productive they are in his presence. He is like a maestro for Manchester City I think.
What Salah is for Liverpool is the same as what De Bruyne is for Manchester City.I believe both teams need their most important players in this championship race as a result. Now they both have these players back in the squad after an injury period so it will be more fun to follow this race.
I read the news that Salah reportedly suffered an injury so he couldn't play against Luton Town in yesterday's match. I don't know whether the injury is really serious or not. But if Salah performs under-performing then it will be a loss for Liverpool. The two teams are currently competing fiercely to win the English league. City have Kevin De Bruyne who is fit and Liverpool also have to play with Salah at his best. These two players will play an important role in every City and Liverpool match. One mistake will cost Liverpool or City the chance to win the title.