In my opinion, no, Osimhen is a great player. There were some issues with Napoli that couldn't be repaired, which is why the club and the team decided to let him go. It's clear that a player like that would have done very well at Napoli, but the disagreements meant that there was no continuation.
Besides the disagreement between Osimhen and Napoli, a player like Osimhen would have been eligible to move to another team if he was no longer needed at Napoli, as Napoli currently has a strong enough squad to face a more challenging season. Therefore, Osimhen's permanent move to Galatasaray is highly feasible, as Galatasaray is very fond of him, and Galatasaray is actively seeking a way to prise him away from Napoli. Now, Galatasaray and Napoli are both ready to embark on their respective seasons.