Saudi clubs are just trying to make news and get enough attention of the football lovers with money and huge signings. To be honest I feel like they are still far from getting to a level where PL and other league competition is.
As for Neymar, good for him as he is getting a huge contract as his career was becoming more and more uncertain at PSG. PSG is kinda club who ditches player too easily. Also there wasn't a club interested like Al-Hilal with huge proposal. It was obvious where he was gonna go and it was a perfect time I would say for Neymar.
While the transfer window is still OPEN Saudi clubs continue to target the players they want, if you compare with the European League it is clearly different, especially with the Premier League I think it is a different class.
New news - Mitrović will soon move from Fulham to Al Hilal just waiting for the green light, this is news again for football lovers.
If Neymar refuses a proposal from an Arab club then there will be no more coming of the same proposal, European clubs are also not much interest except for other leagues besides Europe, in essence Neymar will get big money during a two-year contract, PSG is benefited.