Do you doubt that Napoli became the champion? In order to "officially" complete the title, they need to score only 14 points in the remaining 11 games. And this is provided that Lazio will not lose points. It seems to me that in about 4 games Napoli will officially become the champion because Lazio will not win every game, and Napoli just need to be no worse than the pursuers (which is easy for them because they are better).
If your analysis is correct, then except Napoli is unlucky, nothing can stop them from getting fourteen points from eleven games. A team that have lost only two games in the Seria A and one game in the Champions League will definitely get the needed points. They are also fortunate not to be affected by many injuries and they also have a good bench.
You can check my analysis yourself: in second place is Lazio. Lazio have 52 points and if they win all the games before the end of the championship they will have 85 points. According to the old Napoli regulations, it would have been enough to score 14 points to catch up with Lazio and become champions in additional indicators. But I just checked and according to the new regulations, if the points are equal, a golden match is assigned, so in order to definitely become the champion Napoli need to score 15 points in the remaining 11 games. This percentage of points scored corresponds to the level of Sassuolo - it is extremely unlikely that Napoli will sink so low.