-snip-
Do you doubt with Osimhen? Sure, he deserves to be the main striker of PSG.
He is still a good striker although Napoli coach is no longer Spalletti. You can see the number of goals made by Napoli players, Osimhen is still scoring the most goals of Napoli. He also performs quite well for his country, he doesn't only play well in Napoli.
I think he won't stay in Napoli if there is an offer from top teams in Europe. I'm sure Osimhen knows well that he will have no chance to win the title again if he stays in Napoli. I think he will move to one of EPL top teams or PSG for the next season. We have many issues/news about the departure of Osimhen for the next season.
I think Luis Enrique is not interested in Osimhen because I think Osimhen is not the typical striker needed in his game scheme. Luis Enrique needs a striker who can dribble and get past several of his opponent's defenders instead of a pure striker who just waits for an accurate pass to score a goal. But anything can still happen because player transfers are a very profitable business, it will involve many people instead of just a few.
Gabriel Jesus is one player that I think Luis Enrique is interested in, he has good skills as a striker and he can also play a little wider instead of just a center forward. However, if Luis Enrique has a left winger who is as great as Mbappe, then Osimhen could be a good choice.