Of course, Liverpool is not the only one affected by this. Still, leaving the team at a time like this would be damaging for Liverpool, which is competing for the title. They need Salah to become champions. He's a fantastic striker. He also plays great on the wing. Frankly, it is a privilege to have it. I hope he returns soon.
Mo Salah will prefer to win the AFCON with Egypt than the premier League with Liverpool. Mo Salah has been unlucky at AFCON, he hasn't won it despite been the best player in Africa and having a good teammate. They have reach some finals but always unlucky and Mo Salah wouldn't want to return soon
Liverpool can play well and win without Mo Salah. He's their best goal scorer but he's not a striker. Mo Salah is a winger and there are other good players that can play his position, Liverpool proved it against Arsenal in the FA cup by winning and knocking them out of the tournament.
J.Klopp is an experienced coach and he also has alot of players that he can rotate to bring victory to his team. Other premier league clubs are losing players for AFCON therefore other teams won't be playing at their peak and this give chance for any team to win.
The players going to play AFCON aren't going away for a long time so they won't be missing alot if their teams can hold on until they're back to continue from where they stopped to keep carrying their teams and winning games for them.