Lukaku is a good enough player for me. There are several reasons why Conte is interested in Lukaku. Lukaku has previously played in Conte's squad. So Conte is well aware of Lukaku's capabilities. If Conte can use Lukaku properly, he can serve the Napoli team well.
Moreover, Napoli management is interested in selling Osimhen. Because selling Osimhen now will allow Napoli management to earn a large amount of money. Also, Napoli is not a club that spends big amounts of money to buy players. This is why Conte now wants to add Lukaku to the squad.
If we look at Lukaku career so far, of course we cannot deny that he is one of the great strikers who has ever existed, but the phase he has faced in his career so far has certainly not been easy and has made him ups and downs in his performance, even though he is now is no longer young but in fact he is still very suitable to be used as the main striker for a club, Lukaku has played in several different leagues so far in his career and it seems like Serie A is the most suitable league for him, currently Lukaku is still one of the players that belongs have chelsea and reportedly Chelsea are also starting to offer Lukaku to other teams in order to get some money at this time. Previously, Napoli and Chelsea wanted to exchange players between Osimhen and Lukaku but Chelsea refused after seeing that the amount they got from the deal was very small.
Currently, Napoli is still looking for a team that wants to buy Osimhen and Napoli are even willing to reduce Osimhen current selling price to 100 million euros from the previous 130 million euros, although Osimhen has been an important player for Napoli in the last few seasons but Conte doesn't want to keep him in the squad at this time and actually asked Napoli to bring Lukaku from Chelsea as their main striker next season, the sale of Osimhen will of course provide huge profits for Napoli and that the money can be used to strengthen Napoli in next season.