Barcelona is currently still experiencing a financial crisis. And this is one of the things that new coaches must know, so that the price agreement process must be in place at the beginning before everything is approved. And according to the news, Flick has indeed agreed to the price, which in fact is no more than €3M net euros, or €6M gross.
Reportedly Barcelona is considering selling De Jong, Raphinha and several others. Ansu Fati, Eric Garcia and several other players could also be Barcelona's choices to get this budget, but as you said, I also don't know for sure what steps Barcelona will take to meet the hopes of their new manager next season.
I don't expect De Jong to be sold, nor do some defenders like Araujo. The team's current financial needs are very urgent, but it is still possible for Laporta to get sponsor support to allocate some of it for player spending. Hansi Flick knows what he has to do at the start of his first season, especially in pre-season, he has to try to find the best formula and lineup of players to be included in his main line-up next season.
Yes, apparently there were some player changes when Hansi FLick became their coach. And because of financial issues too, Barcelona will definitely make the quite difficult decision to sell some of their top players first and bring in players who suit Flick and also suit the budget they have. One of them is that they want to sign Joshua Kimmich. But there has been no final decision regarding who will be sold later