Even if the rumors are true, I wouldn't be surprised if the fee was posted for an Osimhen and the fact is he really deserves the label. I don't think there is a loss for any club if they are interested in signing Osimhen because for sure the number of goals scored will increase with Osimhen. But as the team that has hosted Osimhen so far, Napoli certainly want him to last longer and for example a salary increase he really deserves.
But if before this summer closes there is a team that dares to make an offer at 150 million euros, I think Napoli must be willing to let him go and they don't need to be naive because Napoli also needs large funds for the club's finances to be stable or can be used to buy other talented players. There is so much profit to be made by selling Osimhen, but of course Napoli's priority is to keep Osimhen at the club.
As long as Napoli are not having financial problems, I don't think there is any reason to sell Osimhen for purely business reasons that will bring money to the club. he is a good player, has skills and of course his value can increase. Napoli losing a talented player like Osimhen is a loss as a team. and maybe they won't find another young player like Osimhen who will play for Napoli in the future.
as long as Osimhen is comfortable with the team and Napoli can pay him a salary. I think Napoli should keep Osimhen in the team.
I don't think Napoli is a team with financial problems, but if they think winning the Scudetto last season is enough then they might sell Osimhen while the market value is very high and there is also interest from top European teams. Maybe there will be many considerations that Napoli will have to decide for Osimhen. But if he wants to leave for a new challenge, of course Napoli will be happy to open his door and they also don't want to rein in their players who have contributed too much. Now Napoli will not be the same as before considering that the coach is no longer Spalleti, so it is possible that the style of play and the strategy used is also different and that may not match what the previous Napoli players got who were very comfortable when handled by Spalleti.