What is this complain bull shit? How can Barca complain about a buy-out clause getting triggered!?
Player is supposed to buy himself out, no? So PSG has circumvented UEFA rules and probably some accounting rules to keep Neymar's buyout and salary off-the-books. A company owned by the same man who owns the club is paying him an outrageous 300m sponsorship.
Not only does this violate FFP, but more importantly it is constructively third-party ownership. You could say that WC2022 entity essentially holds Neymar's contract as a shell company by buying him out and paying additional money. If Neymar wants to leave, he should find a bank and get a loan to release himself, like the rules say. Any bank would give it to him for a fee.