If the WTO report shows a clear link between the Saudi government and beoutQ (and all that is, is further confirmation of what's been known for years) then they absolutely should block the deal. Put yourself in the PL's shoes - would you approve the ownership of a state that's ripped off your content for years?
Despite all that, unless the PL's argument is bullet proof then it'll be approved. I can't see them having the stomach for any legal challenge that might follow, not least at a time when they're potentially facing legal cases from broadcasters, clubs that have been relegated and possibly even clubs that have been denied promotion.