Inter are a team with a much better history than Napoli in the Serie A of course. They also became champions a couple of years ago too - 2020/21 season. The progress they made last season was really impressive. They improved their performance quite much in the league after the World Cup. They qualified for the Champions League finale too and competed really hard against Manchester City.
It is normal to see them being one of the biggest contenders of the Serie A title now as a result.
However I can agree that Napoli are still very strong now. Despite the manager change Rudi Garcia is also doing a good work for now. They are extremely dominant in their matches. I see Inter - Napoli duo having equal chances for the title now.