We will see if Liverpool really made a mistake by selling Sadio Mane. It is still early to make such predictions about the situation. As I said before, it is depending on how the new trio will play and how Darwin Nunez especially will play in this season. Liverpool got really close to a championship in the league last season but lost their chance by inches. They need to put a bigger effort into it this time to be able to get ahead of Manchester City. They will need to decrease the amount of points lost in easier games to make a difference.
Well, the championship hasn't started yet, so it's not worth reducing everything back to the fight between Liverpool and Manchester City for the title. Moreover, Chelsea looked good in the first half of the last championship. Sadio Mane and Liverpool made their choice and decided to continue their lives separately, and only the upcoming season's tournaments themselves will show whether Liverpool and Tuchel were right to bet on extending their contract with Salah. But in any case, I understand some of the logic of the club when they decided to satisfy the financial needs of only one player of not the youngest age, and not both players.