Let's do some math.
Napoli has a 19-point lead. We are on day 28 and there are 10 rounds of games left.
There are 30 points up for grabs, so if the gap remains the same for 4 weeks, Napoli have mathematically won.
Lazio must see Napoli to lose 4 matches in last 10 rounds to start seeing their chance to catch Napoli and win Scudetto. With such winning form from Napoli, imagine that they lose about half of last 10 matches in Serie A looks very unrealistic.
With the wide gap between Napoli to Lazio which is their closes contender, it's clear that the club has won this season's trophy. Not only because of that, but because their key players are so fit and void of injuries towards the end of the season. They will continue to win most of their matches, at least 75% of them, so nothing could drop them from being the winner of this season.
But I doubt if they will replicate this next season, especially as they are planning to sell Victor Osimhen that has been their most appreciated player for the season.
Lazio don't have Ciro Immobile because of injury and despite of their excellent performance last few weeks, they will have problems with Immobile absence. With this own difficulty, Lazio might not think of Scudetto and they will more realistically to protect their second position in Serie A. It's a best ending they can have in Serie A and their position is not safely enough.