Napoli have been very lucky this season, while their performances have been consistent, other competitors have been inconsistent. Inter Milan and Juventus are struggling to get back into the Champions League zone, while Atalanta, who always sticks to Napoli in second place, has dropped to 4th place. Milan has started to crawl up and occupy second place, Napoli are still safe because they are still three points ahead of Milan. Napoli must maintain a consistent appearance, the Serie A journey is still very far away. Milan can take first place if Napoli cannot maintain its performance in the matches played. Victory is the target to keep its position in first place.
I don't think what Napoli have achieved so far is a luck. They have built a solid team over the last few seasons. If Napoli win this season, I think it is a very well deserved achievement for them. Considering the last few seasons, their performances have actually been very good, it's just that inconsistencies in the second half of the season made Napoli failed to get the title. If this season they are able to fix it, then it's definitely not luck. IMO