It's important to remember that he get s targeted by the other teams, and they use dirty tricks against him to stop him. He gets pulled, pushed, kicked and what not and refs usually don't give him much. Yesterday he was denied a clear pen just because he didn't go to ground.
Even discounting the perceived rough tactics against Mo, it's obvious that opposition teams put special attention on stopping him and denying him space. A lot of teams double up on him which should create space for others. That's probably one of the biggest differences to what he faced last year.
Even the games against Bayern were an example. They didn't necessarily double up on Salah but Alaba hardly crossed the half way line in either leg. Without Mo even doing a huge amount on the ball, he was affecting their ability to attack in both legs.
The good thing with Mane scoring a lot is that it brings attention on him from opposition teams. In doing so, teams have a choice to either double up on him or leave him 1-on-1 with the full back. If they want to try and control Mane and double up on him then it should create space for others. Potentially Salah.