So far Napoli are the only team in Europe's top league that has not lost either in Serie A or in the Champions League. this is a very positive thing for them.
They don't actually need any temporary record. They need to maintain a good form in order to win titles at the end of season. Titles mean more for Napoli, not records.
and it's all not a coincidence but because they are able to keep their good game in every game.
I see them playing fairly evenly in every line and it is very possible that they will be consistent for a long time maybe even until the end of the season, so far Napoli are one of the strongest candidates for the Scudetto. their game is very good and they are consistent.
They also don't need to dominate and win big in every matches. Winning as many matches as possible and collecting as many points as possible are keys for them to win Serie A and get a first Scudetto since a magic season with Maradonna.
In Champions League, they can try the best and hope to achieve something like Atalanta and Roma a few seasons ago. With Napoli, I think they have more chance to win Scudetto than Champions League.