~
Conte interest in Lukaku indicates that Osimhen is unlikely to stay for next season. The situation could change if interested clubs are unwilling to meet Osimhen release clause. De Laurentiis has set a price tag of 130 million euros for anyone who wants Osimhen. It seems that only Saudi Pro League clubs are willing to take serious action, but Osimhen is still considering not leaving Europe. A more plausible reason is that Napoli needs a large budget to build squad depth, and selling Osimhen is a step to smooth their transfer window plans. After a poor season finishing 10th in the Serie A standings and failing to qualify for the Champions League, Napoli revenue has clearly decreased drastically. Therefore, the Napoli management is forced to let go of its best asset, which sounds more acceptable in my opinion.
You are right that Osimhen is not interested in extending his contract with Napoli. This is why Conte is not interested in Osimhen now. He wants to add Lukaku to the squad. Because Napoli management will try their best to sell Osimhen this season. By selling Osimhen, Napoli management will earn a huge amount of money.
Osimhen is talented. He has managed to score a lot of goals in the last two seasons. Several big clubs like PSG, Chelsea, Arsenal and Manchester United are interested in adding a talented player like Osimhen to the squad. However, 130 million euros is a very high price. No club is interested in spending so much money. If it is 75-100 million Europe then maybe Napoli management can sell Osimhen this season. But the Napoli management is not interested in selling Osimhen for less than 130 million euros. Osimhen's future is still completely uncertain.