Yes, Napoli are very serious about adding depth to their squad after winning the Scudetto, but when they appear in the UCL, their strength is still below the level of several other top teams. Real Madrid are also rejuvenating their squad by bringing in quality young players, Barcelona young players are also maturing under Hansi Flick and the arrival of several new players will further increase their strength.
To talk about the chances of winning the title may still be quite speculative because the league has not started, but if you look at a number of Italian representatives at this time, only Napoli is so serious about overhauling the team by bringing in a number of players even though the players they brought in are no longer young, but in terms of experience and mentality they may be slightly better. A number of top teams such as Real Madrid, Barcelona, 
?Manchester City, Liverpool, PSG, and Bayern Munich have also carried out several comprehensive evaluations this season so that a number of these teams are also title contenders next season.it is not true that only Napoli is intending to renew, Juventus like Inter and other teams in Italy (it is the championship that I know and follow most) is renewing many players and trying to take others equally strong, I am sure that foreign teams like in Spain are protecting their strongest players