I find it disgusting that La Liga would reject a team meeting his release clause for the reasons quoted. If PSG feel they can pay it, they are within their rights to do it just as any other club would be, and it's their business whether it's within the limit of FFP or not - they could say that they would just take punishment when it comes and skip a season of CL and they should be allowed to if that's what they want. He has a release clause and anybody that meets it should be allowed to buy him regardless of circumstances. That's what release clauses are for.
I doubt if other players bar Neymar, who is probably will be La Liga face post Messi/Ronaldo find themselves in the same scenario, they can leave without a fuss.
But hey, we're talking about Neymar, a $220 million release clause and countless possibilities that other clubs (ManC, PSG etc...) raiding on La Liga players from now on should this one going through. If UEFA allows this to happen, that's mean they probably admit that their FFP is just an utter joke that can be break single handed.