Osimhen didn't outrightly reject the move to Al Hilal, he turned down offer because the salary. Currently, there's a second improved offer on the table. Also, Galatasaray is fighting to keep him, but he hasn't accepted any deal. Any news about him signing with Al Hilal or Gala is just rumors, nothing has been finalized yet. If I were to guess where he'll be playing next season, I'd say the SPL. Gala cannot match up his salary.
This player seems to have no definite goal and always gets into trouble every time the transfer market opens. Apart from his huge salary, there is another problem faced by his original club so that when an offer is submitted by a club interested in him, it always fails to reach an agreement. He will not stay at Galatasaray because of his desire to play at a much better club, but until now there is no certainty. Playing in the SPL will only get him a big salary like he wants but for individual achievements like playing in Europe will never happen there.