There were rumours before like Napoli were close to signing a contract extension with Osimhen. However there is still no agreement made between the sides. His contract still finishes in less than 2 years so this is likely to be a problem for Napoli as of next summer.
Because I think Osimhen might not want to extend his contract if Napoli have a bad season. The Rudi Garcia period isn't going on very well for now but the season is long of course. If Napoli don't manage to convince Osimhen for a new contract until next summer then I guess they would be open for offers on one hand. The amount they demand would be quite a fortune for sure.
If the rumors are true the club should probably consider the situation resolved because Victor Osimhen isn't quite at his best this season and isn't scoring as many goals as he did. I'm not sure if the team's issue come from the coach, but they are still giving it their all and are now ranked in the top 4 of the league. Regardless of this, I don't think they will win the title this year because the favorite teams are already well ahead of them. Because of the problems he had with the club a few weeks ago, and the fact that he was injured and unable to play in the Champions League, I believe Victor Osimhen has not yet agreed to sign a new contract with the team. However, should he decline to sign a new deal, the team may decide to sell him for a significant sum of money the next season.
The fact that Napoli is able to win and score goals without Osimhen is a very positive thing. It means that it doesn`t depend solely and exclusively on the Nigerian attacker.
Dependence on just one player is never a good or wise thing, even if the player loves the team (he could get injured)
Napoli has continued to play well even without its striker. You are correct that they shouldn't just rely on one player because they might not be available at all. In this case, Osimhen's injured that he couldn't played some matches, but despite this, they gave it their all and defeated Verona with three goals. They show that even without Osimhen, they are still capable.