They signed Raphinha, Kessie, Christensen and Lewandowski. There is no way in hell they can claim not to have the money to pay him. If they don't that means they're going into administration and again, since they're not respecting the contract, he can break it and sign for someone else on a free. The only reason he should even consider doing what you say is if he believed the club was about to go bankrupt. A club that is about to go bankrupt does not do what barcelona are doing. So no, it does not make any sense for him.