Apart from being able to reduce the salary burden they have to pay, selling De Jong will also give them benefits because currently De Jong is one of the highest priced players they have. So it will give them a bit of a financial boost, yes although they will definitely use that money again to recruit players, but as I said before that will reduce the salary burden they have to pay.
Now in my opinion the decision is in the hands of their new coach, if their new coach can provide advice to management and can convince him, then De Jong will be one of the players on the list to be sold. Moreover, we also don't know whether this player fits into the coach's playing scheme or not, because usually the coach has his own criteria for the players he needs.
Losing De Jong will not do Barcelona any good, if we look at De Jong this season his performance has declined slightly and it is possible that other clubs who want to take him also don't want to spend more than 100 million, because De Jong is not the best at the moment , selling De Jong will not reduce the players' salaries which is currently a problem at Barcelona, and Barcelona will also bring in a new coach and of course want several new players.
With the performance shown by De Jong, I think he is still worth keeping and also the player's desire to stay at Barcelona is also very high, it is very likely that he will work hard in the Frendly Match to impress the new coach who will appear in charge of Barcelona next season.