Looking at Napoli's performance in this match, I don't think their goal was to win this match.
They knew that they don't need to win it to take the Scudetto. One point is enough for them to win Scudetto and if they fail, they can win Scudetto if they get only one point in all remaining matches.
I was very disappointed with Napoli's performance in this match. Napoli players have 65% ball possession in this match. Napoli have possession of the ball, but they don't make much of an attacking effort. Napoli made only 7 shots in 90 minutes. Napoli is a strong team. And their attack is very strong. Even then, we don't expect such defensive gameplay from a big team like Napoli. As this team is guaranteed to win the title. And so I don't see any tendency among the players to perform well.
They did not have a good match but see they achieved their purpose, winning the Scudetto after more than 30 years.
Their celebrations are massive and very emotional but it is reasonable as they won their first title after 33 years which are too long in lives of many people.
It is a first time I saw such celebration after AS Roma won their Scudetto in 2000 - 2001 season. Again, players of the champion team were taken clothes off, only their underwears left in celebration of their fans on field.