Osimhen's transfer is not a risky transfer. It's considering Osimhen helped them to won turkish league trophy last season. However, giving him 340k weekly is just so crazy. I wonder where all of their money coming from. They signed Sane, then Osimhen. I've heard they also targeting Calhanoglu from Intermilan too. They follow Saudi club's path.
They know what they are aiming at and so now is the time for them to build that team whereby they will be able pursue the heights they look forward to attain, most likely beyond their own domestic league, beyond adding Osimhen to their squad is the advantages they will be getting having him around on the team, he will be of so much benefit to the team they will see much value in this deal, that is why they are going all in for it.
However, they also need to consider the long term. If they're spending that much money, they should have implemented financial management to avoid financial problems later. They shouldn't do this without considering the risks.
Osimhen has helped them, so it's no surprise they're determined to keep him in the squad. On the other hand, they should also be able to negotiate, as Osimhen is currently struggling to find a team. They should also be able to hold back their price to get the best possible price for the player. Hopefully, they aren't too hasty and have considered this carefully.