Thing is the PL need to have conclusive watertight proof that firstly the Saudis are involved in piracy. Secondly, if they do prove this they need to link it to the relevant people. If they can’t there’ll undoubtedly be huge lawsuits and diplomatic ramifications. I’d expect the Saudis have either zero connection or they’ve covered their tracks superbly.
Also, the PL will certainly not just take the word of the Quateris at face value. They’re as corrupt as the next. Their World Cup bid shows that.
It’s I imagine a massively complex case for the PL and one they need to be 100% sure of when they make their decision.