Juventus is indeed a tough competitor for Inter Milan this season to win the Serie A title, Napoli themselves are much different from last season after changing coaches and will certainly not be able to defend the Serie A title this season. In fact, I think Napoli will have difficulty reaching the top five positions, because from 10th to 4th place, the points are very close to each other so the competition will be even tighter.
Juventus still has a chance to win the Serie A title. They are only 1 point apart and Inter still has 1 match remaining. But that remaining game is against Juventus and I think it will really be a deciding game. If Inter Milan wins then it will be finished. And if Juventus wins then their chance is still there because Juventus is only 1 point behind with Inter winning their 23rd match. This is really interesting and I like this kind of rivalry.
If in the match between Inter v Juventus later then yes, if Inter manages to win, and even though it doesn't fully guarantee the scudetto but of course, Inter will be stronger at the top of the standings. Therefore, of course Inter and Juventus will play all out in their match later because yes, in essence Juventus must prevent Inter from winning in their match later. But yes, if Juventus manages to win, at least Inter will still be able to return to the top position by overtaking Juventus. Therefore, basically their match will clearly be an important match for Inter and also Juventus to keep getting points.