There is no doubt that Antonio Conte is a great coach who has a lot of experience coaching big clubs. So it is not surprising that everyone feels that Conte will be able to make Napoli become a strong club in Serie A again under his coaching. But I'm not sure Oshimen will still be kept from being sold if a high offer comes in. But there is also news that Chelsea, who were initially interested in Osimhen, have apparently abandoned their intention to bring in the Napoli striker. In fact, according to transfer expert Fabrizio Romano, he said that Chelsea are indeed looking for a new striker but Chelsea are not negotiating to bring in Osimhen. So it could be said that the news regarding Chelsea intending to exchange Lukaku for Osimhen is just an issue. And Chelsea actually only wants to let Lukaku go without wanting to exchange him. And I have a feeling that Osimhen will not leave Napoli. Because even though there is a lot of news circulating that big teams want him, in reality it seems like there hasn't been any definite discussion about this and it's probably just an issue.
Yes you are right I also think Antonio Conte is great coach who can help Napoli do well in Serie A. But it's not clear what will happen to Osimhen. Chelsea was interested in him but now they might not be. Even if they offer lot of money, Napoli might not sell him. Chelsea mainly wants to get rid of Lukaku, not trade him for Osimhen. I don't think Osimhen will leave Napoli unless team makes serious offer. If he stays, Conte can help him improve his skills.