Realistically, their chances of winning the league this year are quite low. This year, they will fight to finish the league in the top four places without winning the Scudetto again. I interpret this performance in Napoli this year as quite disappointing. At the end of the year, they will probably part ways with most of their players and return to the Napoli image of trying to finish at the top of the league.
This season will also not be easy for Napoli in terms of getting a top four place even though Napoli will try hard to get that this season. Because everyone can see for themselves how the points competition is happening now where Napoli is very close to several other teams such as Bologna, Atalanta and Fiorentina, all three of which are not bad enough teams this season so their competition will continue and continue until the end of the season later and this will certainly make it difficult for Napoli to get fourth place in Serie A this season.
Actually Napoli at the beginning of this season did appear promising well enough that did looked like they will be able to defend the league title as the defending champions by the end of this season, they were even amongst the top four teams and we're few points from the top, even in the UCL they were doing great too.
The recent decline in Napoli which started after their internal crisis starting with that with osimhen down to the issues with their coach which which led to the changing of their Coach. Napoli after the change of coach won a match or two which made it look like they were improving until now they seem to have gone back to their formal form, hopefully they finish top four but then they still have the UCL to play so the pressure is quite much on them, if they are able to finish top four in the serie A they have done well but I doubt they will be able to defend the league title.